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Note 9 - Accumulated Other Comprehensive Loss - Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Balance	$ 601,249	$ 558,113	$ 585,790	$ 541,497
Balance	625,821	564,097	625,821	564,097
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balance	(9,634)	(8,494)	(7,018)	(8,492)
Other comprehensive income (loss) before reclassifications	3,110	(2,150)	494	(2,152)
Amounts reclassified from accumulated other comprehensive loss	0	0	0	0
Net current-period other comprehensive income (loss)	3,110	(2,150)	494	(2,152)
Balance	$ (6,524)	$ (10,644)	$ (6,524)	$ (10,644)

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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