CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($) |
Sep. 30, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
|---|---|---|---|
| Statement of Financial Position [Abstract] | |||
| Trade accounts receivable, allowance for doubtful accounts | $ 33,000 | $ 14,000 | |
| Preferred stock par value | $ 1.00 | $ 1.00 | $ 1.00 |
| Preferred stock shares authorized | 3,000,000 | 3,000,000 | 3,000,000 |
| Preferred stock shares issued | 0 | 0 | 0 |
| Common stock par value share | $ 0.05 | $ 0.05 | $ 0.05 |
| Common stock shares authorized | 30,000,000 | 30,000,000 | 30,000,000 |
| Common stock shares issued | 9,720,627 | 9,321,927 | 9,252,749 |
| Common stock shares outstanding | 9,720,627 | 9,321,927 | 9,252,749 |
| [custom:AllowanceForDoubtfulAccountsReceivableCurrent1-0] | $ 121,000 | $ 154,000 |
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- References No definition available.
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- Definition Amount of allowance for credit loss on accounts receivable, classified as current. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Face amount or stated value per share of common stock. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The maximum number of common shares permitted to be issued by an entity's charter and bylaws. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- References No definition available.
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