Note 2 - Acquisitions (Details Textual) - USD ($) $ in Thousands		3 Months Ended	6 Months Ended		12 Months Ended
	Jan. 08, 2021	Jun. 30, 2021	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Payments to Acquire Businesses, Net of Cash Acquired, Total			$ 16,811	$ (0)
Goodwill, Ending Balance		$ 28,178	28,178		$ 23,966
EOS Power Panama Inc. [Member]
Revenues, Total					$ 12,000
Payments to Acquire Businesses, Gross		300
Business Combination, Acquisition Related Costs			500
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)
Payments to Acquire Businesses, Gross	9,002
Goodwill, Ending Balance	$ 0
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual		6,000	8,100
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual		$ 1,000	$ 1,400