Quarterly report pursuant to Section 13 or 15(d)

Note 10 - Debt (Details Textual)

v3.20.4
Note 10 - Debt (Details Textual) - The Facility [Member] - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Dec. 21, 2018
Mar. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Revolving Credit Facility [Member]            
Line of Credit Facility, Maximum Borrowing Capacity $ 165.0          
Debt Issuance Costs, Net, Total 0.6          
Proceeds from Long-term Lines of Credit   $ 100.0        
Repayments of Long-term Lines of Credit     $ 50.0 $ 50.0 $ 50.0  
Interest Expense, Debt, Total         0.4 $ 0.1
Debt Covenant, Fixed Charge Coverage Ratio, Maximum Unused Availability $ 18.5          
Debt Instrument, Covenant, Minimum Fixed Charge Coverage Ratio 1.0          
Line of Credit Facility, Remaining Borrowing Capacity       58.9 85.3  
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]            
Debt Instrument, Basis Spread on Variable Rate 1.00%          
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]            
Debt Instrument, Basis Spread on Variable Rate 1.50%          
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]            
Debt Instrument, Basis Spread on Variable Rate 2.00%          
Revolving Credit Facility [Member] | Fed Funds Effective Rate Overnight Index Swap Rate [Member]            
Debt Instrument, Basis Spread on Variable Rate 0.50%          
Revolving Credit Facility [Member] | Additional Margin on Variable Rate Option [Member] | Minimum [Member]            
Debt Instrument, Basis Spread on Variable Rate 0.50%          
Revolving Credit Facility [Member] | Additional Margin on Variable Rate Option [Member] | Maximum [Member]            
Debt Instrument, Basis Spread on Variable Rate 1.00%          
Standby Letters of Credit [Member]            
Letters of Credit Outstanding, Amount       $ 5.8 $ 5.0