Note 2 - Acquisitions (Details Textual) - USD ($) $ in Thousands			3 Months Ended		12 Months Ended
	Mar. 31, 2021	Jan. 08, 2021	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2020
Payments to Acquire Businesses, Net of Cash Acquired, Total			$ (0)	$ 14,759
EOS Power Panama Inc. [Member]
Revenues, Total					$ 12,000
Business Combination, Acquisition Related Costs				200
rms Connectors, Inc. [Member]
Payments to Acquire Businesses, Net of Cash Acquired, Total		$ 9,000
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Consideration Transferred	$ (7,800)
Revenues, Total				2,100
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual				$ 400