Note 2 - Acquisitions (Details Textual) - USD ($) $ in Thousands				6 Months Ended
		Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2020	Jun. 30, 2020
Operating Lease, Right-of-Use Asset		$ 44,544		$ 44,544	$ 44,788
Operating Lease, Liability, Noncurrent		34,961		34,961	36,293
Business Combination, Contingent Consideration, Liability, Total	[1]	3,000		3,000	$ 1,343
Renco Electronics [Member]
Business Combination, Consideration Transferred, Total		30,398	$ 30,398	30,400
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total		10,400	10,400	10,400
Business Acquisition, Goodwill, Expected Tax Deductible Amount		14,000		14,000
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Lease Liabilities				100
Operating Lease, Right-of-Use Asset		3,300		3,300
Operating Lease, Liability, Current		1,800		1,800
Operating Lease, Liability, Noncurrent		1,500		1,500
Business Combination, Contingent Consideration, Liability, Total		3,000	$ 3,000	3,000
Renco Electronics [Member] | Customer Relationships [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total		6,800		$ 6,800
Finite-Lived Intangible Asset, Useful Life (Year)				12 years
Renco Electronics [Member] | Trademarks [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total		$ 3,600		$ 3,600

[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.