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Note 6 - Debt (Details Textual) - Credit Agreement [Member] - USD ($)
$ in Millions
Jan. 05, 2022
Sep. 30, 2023
Jul. 26, 2022
Debt Instrument, Term (Year) 4 years    
Debt Instrument, Face Amount $ 15 $ 20 $ 20
Line of Credit Facility, Maximum Borrowing Capacity $ 100    
Long-Term Debt, Gross   $ 12  
Fed Funds Effective Rate Overnight Index Swap Rate [Member]      
Debt Instrument, Basis Spread on Variable Rate 0.50%    
Fed Funds Effective Rate Overnight Index Swap Rate [Member] | Minimum [Member]      
Debt Instrument, Applicable Margin on Basis Spread 0.25%    
Fed Funds Effective Rate Overnight Index Swap Rate [Member] | Maximum [Member]      
Debt Instrument, Applicable Margin on Basis Spread 1.25%