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Note 2 - Acquisitions (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Sep. 30, 2020
Mar. 31, 2022
Mar. 31, 2021
Jun. 30, 2021
Payments to Acquire Businesses, Net of Cash Acquired, Total       $ 9,902 $ 27,406  
Goodwill, Ending Balance $ 275,127     275,127   $ 278,054
Business Combination, Acquisition Related Costs 419 $ 255   1,561 850  
Sensor Solutions [Member]            
Payments to Acquire Businesses, Net of Cash Acquired, Total 9,900          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total 2,800     2,800    
Goodwill, Ending Balance 6,001     6,001    
Sensor Solutions [Member] | Customer-Related Intangible Assets [Member]            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles $ 2,000     2,000    
Finite-Lived Intangible Asset, Useful Life (Year) 10 years          
Sensor Solutions [Member] | Trademarks [Member]            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets $ 800     800    
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    
Goodwill, Ending Balance 13,991     13,991    
Business Acquisition, Goodwill, Expected Tax Deductible Amount     14,000      
Business Combination, Acquisition Related Costs $ 400 $ 300   $ 1,600 $ 900  
Renco Electronics [Member] | Customer Relationships [Member]            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total     $ 6,800      
Finite-Lived Intangible Asset, Useful Life (Year)     12 years      
Renco Electronics [Member] | Indefinite Trademarks [Member]            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total     $ 3,600