The following table summarizes the estimated fair value of our investments, designated as available-for-sale and classified by the contractual maturity date (Details) - USD ($) |
Jun. 30, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
|---|---|---|---|
| Debt Securities, Available-for-sale [Line Items] | |||
| Estimated Market Value | $ 18,166,000 | $ 18,393,000 | $ 18,461,000 |
| Investments [Member] | |||
| Debt Securities, Available-for-sale [Line Items] | |||
| Amortized Cost, Due within one year | 1,705,000 | 2,759,000 | |
| Estimated Market Value, Due within one year | 1,705,000 | 2,759,000 | |
| Amortized Cost, Due after one year through five years | 4,897,000 | 6,204,000 | |
| Estimated Market Value, Due after one year through five years | 4,897,000 | 6,210,000 | |
| Amortized Cost | 6,602,000 | 8,963,000 | |
| Estimated Market Value | $ 6,602,000 | $ 8,969,000 | $ 9,700,000 |
| X | ||||||||||
- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in next rolling fiscal year following latest fiscal year. For interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date. No definition available.
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| X | ||||||||||
- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in next rolling fiscal year through fifth year following latest fiscal year. For interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date. No definition available.
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| X | ||||||||||
- Definition Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Details
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