Note 3 - Investments - Securities in a Continuous Unrealized Loss Position (Details) $ in Thousands |
Mar. 31, 2022
USD ($)
|
|---|---|
| Less than 12 months, fair value | $ 23,735 |
| Less than 12 months, gross unrealized losses | 852 |
| 12 months or greater, fair value | 3,373 |
| 12 months or greater, gross unrealized losses | 99 |
| US Treasury Securities [Member] | |
| Less than 12 months, fair value | 15,463 |
| Less than 12 months, gross unrealized losses | 694 |
| 12 months or greater, fair value | 0 |
| 12 months or greater, gross unrealized losses | 0 |
| Certificates of Deposit [Member] | |
| Less than 12 months, fair value | 8,272 |
| Less than 12 months, gross unrealized losses | 158 |
| 12 months or greater, fair value | 3,373 |
| 12 months or greater, gross unrealized losses | $ 99 |
| 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), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset. 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), in continuous unrealized loss position for less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
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