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Note 9 - Line of Credit (Details Textual) - PNC Bank [Member] - USD ($)
Dec. 17, 2021
Aug. 25, 2020
Jan. 29, 2022
Revolving Credit Facility [Member]      
Line of Credit Facility, Maximum Borrowing Capacity   $ 25,000,000  
Line of Credit Facility, Maximum Increase in Borrowing Capacity   $ 25,000,000  
Line of Credit Facility, Periodic Payment, Interest, Amount Eliminated $ 500,000    
Line of Credit Facility, Commitment Fee Percentage 0.25%    
Debt Instrument, Covenant, Availability Percentage 10.00% 12.50%  
Debt Instrument, Covenant, Availability, Amount $ 1,875,000 $ 3,125,000  
Debt Instrument, Default, Increase in Interest Rate and Fees   2.00%  
Letters of Credit Outstanding, Amount     $ 750,000
Long-term Line of Credit, Total   $ 0 0
Line of Credit Facility, Remaining Borrowing Capacity     23,300,000
Line of Credit Facility, Current Borrowing Capacity     $ 22,500,000
Debt Issuance Costs, Net, Total   $ 100,000  
Revolving Credit Facility [Member] | Maximum [Member]      
Line of Credit Facility, Commitment Fee Percentage   0.50%  
Revolving Credit Facility [Member] | Minimum [Member]      
Line of Credit Facility, Commitment Fee Percentage   0.375%  
Swingline Loans [Member]      
Line of Credit Facility, Maximum Borrowing Capacity   $ 5,000,000  
Letter of Credit [Member]      
Line of Credit Facility, Maximum Borrowing Capacity   5,000,000  
Letters of Credit Outstanding, Amount   $ 750,000