Note 5 - Accumulated Other Comprehensive Loss - Accumulated 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		$ 21,130	$ 32,118	$ 26,175	$ 34,052
Balance		23,831	30,641	23,831	30,641
AOCI Attributable to Parent [Member]
Balance		(1,857)	(1,224)	(1,778)	(1,285)
Foreign currency translation adjustments (1)	[1]	268	(337)	189	(276)
Balance		$ (1,589)	$ (1,561)	$ (1,589)	$ (1,561)

[1] In all periods presented, there were no tax impacts related to rate changes and no amounts were reclassified to earnings.