Note 5 - Accumulated Other Comprehensive Loss - Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Balance		$ 46,523	$ 23,453	$ 22,321	$ 26,175
Balance		45,898	21,130	45,898	21,130
AOCI Attributable to Parent [Member]
Balance		(1,563)	(2,009)	(1,370)	(1,778)
Foreign currency translation adjustments (1)	[1]	133	152	(60)	(79)
Balance		$ (1,430)	$ (1,857)	$ (1,430)	$ (1,857)

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