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Note 4 - Debt (Details) - USD ($)
$ in Millions
Feb. 15, 2023
Jun. 30, 2023
Dec. 31, 2022
Revolving Credit Facility      
Debt      
Line of Credit Facility, Maximum Borrowing Capacity $ 125.0    
Accordion feature $ 50.0    
Amount of remaining availability   $ 28.9  
Revolving Credit Facility | Secured overnight financing rate      
Debt      
Debt Instrument, Basis Spread on Variable Rate 2.00%    
Revolving Credit Facility | Base Rate      
Debt      
Debt Instrument, Basis Spread on Variable Rate 1.50%    
Revolving Credit Facility | Base Rate | Minimum      
Debt      
Effective interest rate 0.50%    
Revolving Credit Facility | Base Rate | Maximum      
Debt      
Effective interest rate 3.00%    
Senior Notes, net      
Debt      
Estimated fair value   $ 36.0 $ 36.0