Note 5 - Accumulated Other Comprehensive Loss - Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Beginning balance		$ 45,898	$ 21,130	$ 22,321	$ 26,175
Ending balance		46,444	23,831	46,444	23,831
AOCI Attributable to Parent [Member]
Beginning balance		(1,430)	(1,857)	(1,370)	(1,778)
Foreign currency translation adjustments (1)	[1]	(153)	268	(213)	189
Ending balance		$ (1,583)	$ (1,589)	$ (1,583)	$ (1,589)

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