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Note 3 - Debt (Details Textual)
1 Months Ended 12 Months Ended
May 19, 2021
USD ($)
Apr. 30, 2020
USD ($)
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
Jul. 07, 2021
USD ($)
Jun. 29, 2021
USD ($)
Apr. 12, 2021
USD ($)
Mar. 08, 2021
USD ($)
Proceeds from Issuance of Unsecured Debt     $ 1,690,385        
Revolving Credit Facility [Member] | JPMorgan Chase Bank N.A. [Member]                
Line of Credit Facility, Maximum Borrowing Capacity               $ 10,000,000
Long-term Line of Credit, Total     $ 0          
Revolving Credit Facility [Member] | JPMorgan Chase Bank N.A. [Member] | Subsequent Event [Member]                
Line of Credit Facility, Maximum Borrowing Capacity             $ 20,000,000  
ABL Facility [Member] | JPMorgan Chase Bank N.A. [Member] | Subsequent Event [Member]                
Line of Credit Facility, Maximum Borrowing Capacity $ 40,000,000              
Long-term Line of Credit, Total         $ 11,448,646 $ 0    
Debt Instrument, Covenant, Borrowing Limit as Percent of Accounts Receivable 85.00%              
Debt Instrument, Covenant, Borrowing Limit, Factor Multiplied by the Net Orderly Liquidating Value of Inventory, Percentage 85.00%              
Debt Instrument, Covenant, Borrowing Limit, Factor Multiplied by the Net Orderly Liquidating Value of Equipment, Percentage 85.00%              
Debt Instrument, Covenant, Borrowing Limit, Machinery and Equipment Component Limit $ 5,000,000              
Debt Instrument, Covenant, Fixed Charge Coverage Ratio 1.1              
Line of Credit Facility, Maximum Borrowing Capacity, Maximum Conditional Increase $ 10,000,000              
Line of Credit Facility, Maximum Borrowing Capacity, Conditional Increase, Minimum Increments $ 5,000,000              
ABL Facility [Member] | JPMorgan Chase Bank N.A. [Member] | Subsequent Event [Member] | London Interbank Offered Rate (LIBOR) [Member]                
Debt Instrument, Basis Spread on Variable Rate 1.70%              
Paycheck Protection Program CARES Act [Member]                
Proceeds from Issuance of Unsecured Debt   $ 1,690,385