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Note 3 - Investments (Tables) | 12 Months Ended
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Dec. 31, 2021
Notes Tables |
Debt Securities, Available-for-sale [Table Text Block] |
|  | December 31, 2021 |
|  | Amortized Cost |  |  | Accrued Interest |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Fair Value |
Obligations of U.S. Government and its agencies |  | $ | 4,043 |  |  | $ | 17 |  |  | $ | - |  |  | $ | (7 | ) |  | $ | 4,053 |
Corporate debt securities |  |  | 4,294 |  |  |  | 40 |  |  |  | - |  |  |  | (5 | ) |  |  | 4,329 |
Certificates of deposit |  |  | 1,652 |  |  |  | 8 |  |  |  | - |  |  |  | (1 | ) |  |  | 1,659 |
Total Investments |  | $ | 9.989 |  |  | $ | 65 |  |  | $ | - |  |  | $ | (13 | ) |  | $ | 10,041 |
|  | December 31, 2020 |
|  | Amortized Cost |  |  | Accrued Interest |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Fair Value |
Obligations of U.S. Government and its agencies |  | $ | 24,986 |  |  | $ | 14 |  |  | $ | 3 |  |  | $ | (3 | ) |  | $ | 25,000 |
Certificates of deposit |  |  | 3,225 |  |  |  | 11 |  |  |  | 3 |  |  |  | − |  |  |  | 3,239 |
Total Investments |  | $ | 28,211 |  |  | $ | 25 |  |  | $ | 6 |  |  | $ | (3 | ) |  | $ | 28,239 |
Debt Securities, Held-to-maturity [Table Text Block] |
|  | 2021 |  |  | 2020 |
Maturing in one year or less |  | $ | 3,212 |  |  | $ | 28,239 |
Maturing after one year through two years |  |  | 6,829 |  |  |  | − |
Total investments |  | $ | 10,041 |  |  | $ | 28,239 |

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- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 + Details
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- Definition Tabular disclosure of information about investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5B -URI http://asc.fasb.org/extlink&oid=123581744&loc=SL120269825-111563 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5A -URI http://asc.fasb.org/extlink&oid=123581744&loc=SL120269820-111563 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27232-111563 + Details
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