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Note 2 - Acquisitions (Details Textual) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Mar. 31, 2021
Mar. 31, 2021
Mar. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Payments to Acquire Businesses, Net of Cash Acquired, Total   $ 27,406 $ (0)    
Operating Lease, Right-of-Use Asset $ 39,303 39,303     $ 44,788
Operating Lease, Liability, Current 8,408 8,408     8,016
Operating Lease, Liability, Noncurrent 30,488 30,488     36,293
Business Combination, Contingent Consideration, Liability, Total 3,000 3,000     $ 1,343 [1]
Renco Electronics [Member]          
Payments to Acquire Businesses, Net of Cash Acquired, Total 27,400        
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 contingent consideration that has been earned to date.