Note 5 - Accumulated Other Comprehensive Loss - Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2022	Mar. 31, 2021
Beginning balance		$ 46,200	$ 22,321
Ending balance		45,133	46,523
AOCI Attributable to Parent [Member]
Beginning balance		(1,604)	(1,370)
Foreign currency translation adjustments (1)	[1]	(70)	(193)
Ending balance		$ (1,674)	$ (1,563)

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