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Note 17 - Subsequent Event (Details Textual) - USD ($)
$ in Millions
Apr. 05, 2021
Apr. 02, 2021
Mar. 31, 2021
Senior Unsecured Notes [Member]      
Long-term Debt, Total     $ 300.0
Subsequent Event [Member] | The 2021 Credit Agreement [Member]      
Debt Instrument, Collateral, Percentage of Stock of First Tier Foreign Subsidiaries 65.00%    
Debt Instrument, Covenant, Adjusted EBITDA, Maximum 3.50    
Debt Instrument, Covenant, Minimum Permitted Acquisition, Alternative Requirements for Indebtedness to EBITDA Ratio $ 50.0    
Debt Instrument, Covenant, Adjusted EBITDA to Interest Expense Ratio, Minimum 3.00    
Debt Instrument, Covenant, Minimum Leverage Ratio for Dividends or Repurchase of Stock 2.50    
Debt Instrument, Restrictions, Maximum Dividends Payout or Repurchase of Stock $ 60.0    
Subsequent Event [Member] | The 2021 Credit Agreement [Member] | Fed Funds Effective Rate Overnight Index Swap Rate [Member]      
Debt Instrument, Basis Spread on Variable Rate 0.50%    
Subsequent Event [Member] | The 2021 Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member]      
Debt Instrument, Variable Rate Floor 1.00%    
Subsequent Event [Member] | The 2021 Credit Agreement [Member] | LIBOR on Eurocurrency Liabilities [Member]      
Debt Instrument, Variable Rate Floor 0.00%    
Subsequent Event [Member] | The 2021 Credit Agreement [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member]      
Debt Instrument, Basis Spread on Variable Rate 0.10%    
Subsequent Event [Member] | The 2021 Credit Agreement [Member] | Minimum [Member] | LIBOR on Eurocurrency Liabilities [Member]      
Debt Instrument, Basis Spread on Variable Rate 1.10%    
Subsequent Event [Member] | The 2021 Credit Agreement [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member]      
Debt Instrument, Basis Spread on Variable Rate 0.70%    
Subsequent Event [Member] | The 2021 Credit Agreement [Member] | Maximum [Member] | LIBOR on Eurocurrency Liabilities [Member]      
Debt Instrument, Basis Spread on Variable Rate 1.70%    
Subsequent Event [Member] | The 2021 Credit Agreement [Member] | Revolving Credit Facility [Member]      
Line of Credit Facility, Maximum Borrowing Capacity $ 450.0    
Line of Credit Facility, Additional Borrowings Option $ 275.0    
Subsequent Event [Member] | The 2021 Credit Agreement [Member] | Revolving Credit Facility [Member] | Minimum [Member]      
Line of Credit Facility, Commitment Fee Percentage 0.15%    
Subsequent Event [Member] | The 2021 Credit Agreement [Member] | Revolving Credit Facility [Member] | Maximum [Member]      
Line of Credit Facility, Commitment Fee Percentage 0.30%    
Subsequent Event [Member] | The 2021 Credit Agreement [Member] | Term Loan [Member]      
Debt Instrument, Face Amount $ 100.0    
Subsequent Event [Member] | Senior Unsecured Notes [Member]      
Long-term Debt, Total   $ 300.0  
Debt Instrument, Interest Rate, Stated Percentage   5.625%  
Debt Instrument, Redemption Premium   $ 8.4  
Write off of Deferred Debt Issuance Cost   $ 2.8