Note 4 - Fair Value Measurements (Details Textual) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Sep. 30, 2021	Dec. 31, 2021	Dec. 31, 2020
Payment for Contingent Consideration Liability, Financing Activities		$ 1,167	$ (0)
GS Engineering [Member]
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High		12,800
Renco Electronics [Member]
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High		$ 2,200
Payment for Contingent Consideration Liability, Financing Activities	$ 1,200