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Note 13 - Line of Credit (Details Textual) - USD ($)
Aug. 25, 2020
Oct. 31, 2020
Sep. 30, 2020
May 28, 2020
PNC Bank [Member] | 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      
Debt Instrument, Covenant, Availability Percentage 12.50%      
Debt Instrument, Covenant, Availability, Amount $ 3,125,000      
Debt Instrument, Default, Increase in Interest Rate and Fees 2.00%      
Long-term Line of Credit, Total $ 0      
Line of Credit Facility, Remaining Borrowing Capacity   $ 11,500,000    
Letters of Credit Outstanding, Amount   1,000,000.0    
Line of Credit Facility, Current Borrowing Capacity   $ 10,500,000    
Debt Issuance Costs, Net, Total $ 600,000      
Debt Instrument, Term (Year) 5 years      
PNC Bank [Member] | Revolving Credit Facility [Member] | Minimum [Member]        
Debt Instrument, Anticipated Annual Costs $ 500,000      
PNC Bank [Member] | Revolving Credit Facility [Member] | Maximum [Member]        
Debt Instrument, Anticipated Annual Costs 600,000      
PNC Bank [Member] | Swingline Loans [Member]        
Line of Credit Facility, Maximum Borrowing Capacity 5,000,000      
PNC Bank [Member] | Letter of Credit [Member]        
Line of Credit Facility, Maximum Borrowing Capacity 5,000,000      
Long-term Line of Credit, Total $ 1,000,000.0      
U.S. Bank National Association [Member] | Line of Credit [Member]        
Line of Credit Facility, Maximum Borrowing Capacity       $ 10,000,000
Long-term Line of Credit, Total     $ 0  
U.S. Bank National Association [Member] | Letter of Credit [Member]        
Long-term Line of Credit, Total     $ 1,000,000.0