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Note 8 - Long-term Obligations (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended 24 Months Ended
Jan. 15, 2019
Sep. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Dec. 31, 2023
Sep. 30, 2020
Sep. 30, 2019
Jun. 30, 2023
Jun. 30, 2020
Jun. 30, 2022
Dec. 31, 2019
Jun. 28, 2019
Repayments of Long-term Debt, Total           $ 6,641 $ 172,903          
Gain (Loss) on Extinguishment of Debt, Total   $ 0   $ 0   0 $ (2,830)          
Interest Rate Swap [Member]                        
Derivative, Final Notional Amount                       $ 67,500
Derivative, Fixed Interest Rate                       6.1735%
London Interbank Offered Rate (LIBOR) [Member] | Interest Rate Swap [Member]                        
Derivative, Basis Spread on Variable Rate                       4.50%
The 2019 Senior Credit Facility [Member]                        
Debt Instrument, Unamortized Discount, Total   1,690       1,690         $ 2,234  
Debt Issuance Costs, Gross $ 2,683                      
Debt Agreement, Alternate Base Rate, Percentage Lower Than LIBOR Margin 1.00%                      
Debt Instrument, Periodic Payment, Total                 $ 1,125      
Debt Instrument, Periodic Payment, Principal     $ 2,104                  
Debt Instrument Covenants, Minimum Borrowing   $ 90,000       $ 90,000            
Weighted Average Life of Senior Credit Facility (Year)           2 years            
The 2019 Senior Credit Facility [Member] | Forecast [Member]                        
Debt Instrument, Periodic Payment, Total         $ 4,500     $ 3,375   $ 2,250    
The 2019 Senior Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]                        
Debt Instrument, Basis Spread on Variable Rate 4.50%                      
The 2019 Senior Credit Facility [Member] | Initial Term A Facility [Member]                        
Debt Instrument, Face Amount $ 180,000                      
Line of Credit Facility, Maximum Borrowing Capacity 20,000                      
The 2019 Senior Credit Facility [Member] | Delayed-Draw Term A Facility [Member]                        
Debt Agreement, Maximum Borrowing Capacity 25,000                      
The 2019 Senior Credit Facility [Member] | Incremental Term A Loans [Member]                        
Debt Agreement, Minimum Incremental Borrowing Capacity 60,000                      
Proceeds from Issuance of Long-term Debt, Net of Discounts 178,335                      
Debt Instrument, Unamortized Discount, Total 1,665                      
The 2017 Senior Credit Facility [Member]                        
Interest Paid, Including Capitalized Interest, Operating and Investing Activities, Total 590                      
Payments of Debt Issuance Costs 2,270                      
Repayments of Senior Debt, Total 171,750                      
Gain (Loss) on Extinguishment of Debt, Total 2,830                      
The 2017 Senior Credit Facility [Member] | Term A-1 Facility [Member]                        
Repayments of Long-term Debt, Total 112,500                      
The 2017 Senior Credit Facility [Member] | Term A-2 Facility [Member]                        
Repayments of Long-term Debt, Total $ 59,250