Note 4 - Fair Value Measurements (Details Textual) - USD ($) $ in Thousands		Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020
Business Combination, Contingent Consideration, Liability, Total	[1]	$ 3,000		$ 1,343
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		3,500
Business Combination, Contingent Consideration, Liability, Total		$ 3,000	$ 3,000

[1] The fair value of our contingent consideration arrangement is determined based on our evaluation as to the probability and amount of any deferred compensation that has been earned to date.