Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) |
12 Months Ended | |
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Dec. 31, 2019 |
Dec. 31, 2018 |
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| Summary of Significant Accounting Policies [Line Items] | ||
| Cash and cash equivalents | $ 13,928,504 | $ 11,056,426 |
| Money market funds | $ 8,761,000 | |
| Value of the investment in short-term money market funds sought to be preserved (in dollars per share) | $ 1.00 | |
| Depreciation | $ 1,028,000 | 1,249,000 |
| Product warranty period | 5 years | |
| Research and development costs | $ 3,600,000 | 3,542,000 |
| Maximum matching percentage by employer | 6.00% | |
| Contributions to the plan | $ 401,000 | $ 450,000 |
| Dilutive shares | 65,163 | 0 |
| Employee Stock Option [Member] | ||
| Summary of Significant Accounting Policies [Line Items] | ||
| Shares not included in the computation of diluted earnings per share | 860,539 | 1,320,492 |
| Deferred Stock Awards [Member] | ||
| Summary of Significant Accounting Policies [Line Items] | ||
| Shares not included in the computation of diluted earnings per share | 178,278 | 265,491 |
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- Definition Product warranty period No definition available.
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- Definition Summary Of Significant Accounting Policies [Line Items] No definition available.
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- Definition Value of the investment in short-term money market funds sought to be preserved (in dollars per share) No definition available.
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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. No definition available.
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- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. No definition available.
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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Investment in short-term money-market instruments (such as commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and so forth) which are highly liquid (that is, readily convertible to known amounts of cash) and so near their maturity that they present an insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify as cash equivalents by definition. Original maturity means an original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months. No definition available.
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- Definition The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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