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Note 6 - Marketable Securities (Details Textual) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Marketable Securities, Total	$ 42,751		$ 47,109
Debt Securities, Available-for-Sale, Total	3,839		3,902
Debt Securities, Available-for-Sale, Unrealized Gain (Loss), Total	163		226
Equity Securities, FV-NI, Unrealized Gain (Loss), Total	(4,100)	$ (1,765)
Debt Securities, Available-for-Sale, Realized Gain (Loss), Total	0		$ 0
Proceeds from Sale and Maturity of Debt Securities, Available-for-Sale, Total	$ 0	$ 0

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).

+ References

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