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Note 8 - Debt (Details Textual)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
USD ($)
Jun. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Extraordinary and Certain Other Defined Items Excluded from Adjusted EBIT   $ 20,000    
Extraordinary and Certain Other Defined Items Excluded from Adjusted EBIT, Percentage of EBITDA   10.00%    
Interest Coverage Ratio, Actual   13.10    
Leverage Ratio, Requirement, Maximum Under Certain Circumstances in Connection Material Acquisition   4.0    
Leverage Ratio, Actual   1.31    
Long-term Line of Credit, Total   $ 200,000    
Line of Credit Facility, Interest Rate at Period End   2.59%    
Renco Electronics [Member]        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt   $ 712 $ 712  
SBA CARES Act Paycheck Protection Program [Member] | Renco Electronics [Member]        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt     $ 700  
Minimum [Member]        
Interest Coverage Ratio, Requirement   2.75    
Maximum [Member]        
Leverage Ratio, Requirement   3.5    
Amended and Restated Credit Agreement [Member]        
Debt Instrument, Term (Year) 5 years      
Line of Credit Facility, Maximum Borrowing Capacity $ 500,000      
Line Of Credit, Accordion Feature 250,000      
Line of Credit Facility, Current Borrowing Capacity   $ 245,200    
Swing Line Loan [Member]        
Line of Credit Facility, Maximum Borrowing Capacity 10,000      
Letter of Credit [Member]        
Line of Credit Facility, Maximum Borrowing Capacity $ 35,000      
Standby Letters of Credit [Member]        
Long-term Line of Credit, Total   $ 6,000   $ 7,300