Note 1 - Organization and Significant Accounting Policies - Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020
Beginning balance		$ 22,321	$ 26,175
Ending balance		46,200	22,321
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Beginning balance		(1,370)	(1,778)
Foreign currency translation adjustments (1)	[1]	(234)	408
Ending balance		$ (1,604)	$ (1,370)

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