Note 5 - Goodwill and Other Intangible Assets - Amortization (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Intangible asset amortization	$ 1,637	$ 1,902	$ 1,841
Power and Electromechanical Business [Member]
Intangible asset amortization	400	661	768
Trademarks and Trade Names [Member]
Intangible asset amortization	153	160	154
Customer-Related Intangible Assets [Member]
Intangible asset amortization	595	622	600
Developed Technology Rights [Member]
Intangible asset amortization	32	33	30
Technology-Based Intangible Assets [Member]
Intangible asset amortization	253	265	255
Computer Software, Intangible Asset [Member]
Intangible asset amortization	204	161	32
Other Intangible Assets [Member]
Intangible asset amortization			$ 2