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Note 9 - Line of Credit (Details) - Line of Credit [Member] - USD ($)
1 Months Ended 9 Months Ended
Aug. 29, 2018
Mar. 31, 2017
Dec. 31, 2018
Mar. 31, 2018
Note 9 - Line of Credit (Details) [Line Items]        
Line of Credit Facility, Expiration Date May 31, 2019 Mar. 31, 2018    
Line of Credit Facility, Maximum Borrowing Capacity   $ 1,000,000    
Repayments of Long-term Lines of Credit $ 100,000      
Long-term Line of Credit 900,000   $ 820,000 $ 1,000,000
Line of Credit Facility, Periodic Payment $ 50,000      
Line of Credit Facility, Interest Rate at Period End     5.915%  
Debt Instrument, Payment Terms The Company will make principal payments of $5,000 per month from September 30, 2018 through November 30, 2018 and principal payments of $10,000 per month from December 31, 2018 to May 31, 2019.      
Repayments of Lines of Credit     $ 180,000  
Line of Credit Facility, Remaining Borrowing Capacity     $ 0  
London Interbank Offered Rate (LIBOR) [Member]        
Note 9 - Line of Credit (Details) [Line Items]        
Debt Instrument, Basis Spread on Variable Rate 3.75%