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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		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Contingent Payments [Member]
Balance at beginning of reporting period, liability	$ (769)	$ (1,520)	$ (924)	$ (1,712)
Included in interest income (expense), liability	(8)	(22)	(21)	(48)
Included in other comprehensive income (loss), liability	0	0	0	0
Included in other items, net, liability	(23)	238	3	221
Settlements, liability	311	29	453	264
Balance at end of reporting period, liability	(489)	(1,275)	(489)	(1,275)
Investment, Available-For-Sale [Member]
Balance at beginning of reporting period, asset	16,297	17,745	16,692	16,151
Included in interest income (expense), asset	41	39	82	78
Included in other comprehensive income (loss), asset	(52)	(367)	(488)	1,188
Included in other items, net, asset	0	0	0	0
Settlements, asset	(590)	(550)	(590)	(550)
Balance at end of reporting period, asset	$ 15,696	$ 16,867	$ 15,696	$ 16,867

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 income from liability measured at fair value on recurring basis using unobservable input (level 3).

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