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Note 4 - Investments - Securities in a Continuous Unrealized Loss Position (Details) $ in Thousands	Mar. 31, 2023 USD ($)
Fair value unrealized loss, less than 12 months	$ 2,017
Gross unrealized loss, less than 12 months	43
Fair value unrealized loss, greater than 12 months	26,282
Gross unrealized loss, greater than 12 months	1,108
US Treasury Securities [Member]
Fair value unrealized loss, less than 12 months	0
Gross unrealized loss, less than 12 months	0
Fair value unrealized loss, greater than 12 months	15,433
Gross unrealized loss, greater than 12 months	798
Certificates of Deposit [Member]
Fair value unrealized loss, less than 12 months	2,017
Gross unrealized loss, less than 12 months	43
Fair value unrealized loss, greater than 12 months	10,849
Gross unrealized loss, greater than 12 months	$ 310

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.

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