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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, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Contingent Payments [Member]
Balance at beginning of reporting period, liability	$ (1,275)	$ (2,072)	$ (1,712)	$ (2,407)
Included in interest income (expense), liability	(18)	(33)	(66)	(109)
Included in other comprehensive income (loss), liability	0	0	0	0
Included in other items, net, liability	(59)	40	162	(21)
Settlements, liability	206	207	470	679
Balance at end of reporting period, liability	(1,146)	(1,858)	(1,146)	(1,858)
Investment, Available-For-Sale [Member]
Balance at beginning of reporting period, asset	16,867	15,963	16,151	15,772
Included in interest income (expense), asset	38	37	116	112
Included in other comprehensive income (loss), asset	322	751	1,510	1,377
Included in other items, net, asset	0	0	0	0
Settlements, asset	0	0	(550)	(510)
Balance at end of reporting period, asset	$ 17,227	$ 16,751	$ 17,227	$ 16,751

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

No definition available.

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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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-Publisher FASB
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-SubTopic 10
-Section 50
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+ References

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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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