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Note 8 - Line of Credit (Details) - USD ($)
1 Months Ended 2 Months Ended 3 Months Ended 5 Months Ended 12 Months Ended
Aug. 29, 2018
Jun. 30, 2019
Sep. 30, 2018
Oct. 31, 2018
Jun. 30, 2019
May 31, 2019
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Note 8 - Line of Credit (Details) [Line Items]                  
Line of Credit Facility, Date of First Required Payment       Oct. 01, 2018          
Line of Credit [Member]                  
Note 8 - Line of Credit (Details) [Line Items]                  
Line of Credit Facility, Maximum Borrowing Capacity                 $ 1,000,000
Repayments of Long-term Lines of Credit $ 100,000       $ 50,000   $ 200,000    
Long-term Line of Credit $ 900,000 $ 750,000     $ 750,000   $ 800,000 $ 1,000,000  
Line of Credit Facility, Periodic Payment, Principal     $ 5,000 $ 50,000   $ 10,000      
Line of Credit Facility, Borrowing Capacity, Description       Borrowing base calculation tied to accounts receivable and inventories.          
Line of Credit Facility, Expiration Date       May 31, 2019          
Debt Instrument, Basis Spread on Variable Rate   3.75%              
Line of Credit Facility, Interest Rate at Period End   6.14425% 5.915%   6.14425%        
Debt Instrument, Periodic Payment   $ 10,000              
Line of Credit Facility, Collateral         The line is collateralized by substantially all of the assets of the Company.        
Debt Instrument, Payment Terms         The Company will make principal payments of $10,000 per month until March 31, 2020        
Line of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member]                  
Note 8 - Line of Credit (Details) [Line Items]                  
Debt Instrument, Basis Spread on Variable Rate     3.75%