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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, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Contingent Payments [Member]
Balance at beginning of reporting period, liability	$ (1,520)	$ (2,280)	$ (1,712)	$ (2,407)
Included in interest income (expense), liability	(22)	(36)	(48)	(76)
Included in other comprehensive income (loss), liability	0	0	0	0
Included in other items, net, liability	238	4	221	(61)
Settlements, liability	29	240	264	472
Balance at end of reporting period, liability	(1,275)	(2,072)	(1,275)	(2,072)
Investment, Available-For-Sale [Member]
Balance at beginning of reporting period, asset	17,745	16,452	16,151	15,772
Included in interest income (expense), asset	39	37	78	75
Included in other comprehensive income (loss), asset	(367)	(16)	1,188	626
Included in other items, net, asset	0	0	0	0
Settlements, asset	(550)	(510)	(550)	(510)
Balance at end of reporting period, asset	$ 16,867	$ 15,963	$ 16,867	$ 15,963

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- 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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