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Note 8 - Fair Value Measurements - Changes in Fair Value of Level 3 Assets and Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Contingent Payments [Member]
Balance at beginning of reporting period, liability	$ (489)	$ (1,275)	$ (924)	$ (1,712)
Included in interest income (expense), liability	(4)	(18)	(26)	(66)
Included in other comprehensive income (loss), liability	0	0	0	0
Included in other items, net, liability	18	(59)	21	162
Settlements, liability	195	206	649	470
Balance at end of reporting period, liability	(280)	(1,146)	(280)	(1,146)
Investment, Available-For-Sale [Member]
Balance at beginning of reporting period, asset	15,696	16,867	16,692	16,151
Included in interest income (expense), asset	39	38	121	116
Included in other comprehensive income (loss), asset	328	322	(160)	1,510
Included in other items, net, asset	0	0	0	0
Settlements, asset	0	0	(590)	(550)
Balance at end of reporting period, asset	$ 16,063	$ 17,227	$ 16,063	$ 17,227

X

- Definition

Amount of gain (loss) recognized in other items, net from asset measured at fair value on recurring basis using unobservable input (level 3).

+ References

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- Definition

Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3).

+ References

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Amount of gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3).

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-Publisher FASB
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Amount of gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3).

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