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Note 9 - Line of Credit and Long-term Debt (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Mar. 16, 2020
Nov. 30, 2020
Nov. 30, 2020
Nov. 30, 2019
Proceeds from Notes Payable, Total     $ 1,537,200
Forgiveness of Indebtedness     $ 107,700
SBA Loans [Member]        
Debt Instrument, Interest Rate, Stated Percentage   1.00% 1.00%  
Proceeds from Notes Payable, Total $ 1,500,000      
Forgiveness of Indebtedness   $ 108,000    
Interest Expense, Debt, Total     $ 9,700  
Eligible Accounts Receivable [Member]        
Maximum Draws Allowed 50.00%      
Eligible Inventories [Member]        
Maximum Draws Allowed 50.00%      
Line of Credit [Member] | Wells Fargo Bank [Member]        
Line of Credit Facility, Maximum Borrowing Capacity $ 5,000,000 $ 5,000,000 $ 5,000,000  
Proceeds from Lines of Credit, Total $ 3,400,000      
Debt Instrument, Interest Rate, Stated Percentage   2.40% 2.40%  
Debt Instrument, Covenant, Adjusted EBITDA   $ 1,500,000 $ 1,500,000  
Line of Credit [Member] | Wells Fargo Bank [Member] | London Interbank Offered Rate (LIBOR) [Member]        
Debt Instrument, Basis Spread on Variable Rate 2.25%