Note 11 - Segment Information - Operating Information by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Net sales	$ 13,469	$ 14,948
Income (loss) from operations	220	(1,448)
Other income, net	20	93
Income (loss) before income taxes	240	(1,355)
Operating Segments [Member]
Income (loss) from operations	2,644	1,150
Intersegment Eliminations [Member]
Income (loss) from operations	(2,424)	(2,598)
CHINA
Net sales	508	698
CHINA | Operating Segments [Member]
Income (loss) from operations	(7)	(83)
Russia and Kazakhstan [Member]
Net sales	191	242
Russia and Kazakhstan [Member] | Operating Segments [Member]
Income (loss) from operations	(48)	(82)
Primary Reporting Segment [Member]
Net sales	12,770	14,008
Primary Reporting Segment [Member] | Operating Segments [Member]
Income (loss) from operations	$ 2,699	$ 1,315