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Note 7 - Indebtedness (Details Textual)
$ / shares in Units, $ in Thousands
Oct. 11, 2023
USD ($)
Mar. 05, 2021
USD ($)
Aug. 12, 2019
USD ($)
$ / shares
Oct. 05, 2023
USD ($)
Sep. 30, 2023
USD ($)
Mar. 31, 2023
USD ($)
Long-Term Line of Credit         $ 0 $ 13,000
Senior Secured Credit Agreement [Member]            
Long-Term Line of Credit         $ 0  
Debt Instrument, Covenant, Maximum Total Leverage Ratio for the Fifth, Sixth, Seventh, and Eighth Testing Dates   4.5        
Debt Instrument, Covenant, Maximum Conditional Total Leverage Ratio Following an Acquisition   5.75        
Senior Secured Credit Agreement [Member] | Subsequent Event [Member]            
Proceeds from Lines of Credit $ 65,000          
Long-Term Debt, Weighted Average Interest Rate, over Time 6.90%          
Senior Secured Credit Agreement [Member] | Maximum [Member]            
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage   0.35%        
Senior Secured Credit Agreement [Member] | Maximum [Member] | The Credit Facility Term Loan [Member]            
Line of Credit Facility, Maximum Borrowing Capacity   $ 75,000        
Senior Secured Credit Agreement [Member] | Maximum [Member] | The Credit Facility Term Loan [Member] | Subsequent Event [Member]            
Line of Credit Facility, Maximum Borrowing Capacity       $ 125,000    
Senior Secured Credit Agreement [Member] | Minimum [Member]            
Fixed Charge Coverage Ratio   1.25        
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage   0.15%        
Senior Secured Credit Agreement [Member] | Minimum [Member] | The Credit Facility Term Loan [Member]            
Line of Credit Facility, Maximum Borrowing Capacity   $ 25,000        
Senior Secured Credit Agreement [Member] | Swingline Loan [Member] | Maximum [Member]            
Line of Credit Facility, Maximum Borrowing Capacity   5,000        
The Notes [Member] | Senior Notes [Member]            
Debt Instrument, Face Amount     $ 172,500      
Proceeds from Convertible Debt     $ 167,056      
Debt Instrument, Interest Rate, Stated Percentage     1.375%   1.375%  
Debt Instrument, Convertible, Conversion Ratio Per 1,000 Principal     3.5273      
Debt Instrument, Convertible, Conversion Price (in dollars per share) | $ / shares     $ 283.5      
Debt Instrument, Interest Rate, Effective Percentage         1.90%  
Revolving Credit Facility [Member] | Senior Secured Credit Agreement [Member]            
Line of Credit Facility, Maximum Borrowing Capacity   75,000        
Letter of Credit [Member] | Senior Secured Credit Agreement [Member] | Maximum [Member]            
Line of Credit Facility, Maximum Borrowing Capacity   $ 2,500