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Note 8 - Line of Credit (Details Textual) - USD ($)
Jun. 15, 2018
Sep. 30, 2018
Mar. 31, 2018
Short-term Debt, Total   $ 55,105
Revolving Credit Facility [Member]      
Line of Credit Facility, Maximum Borrowing Capacity $ 400,000    
Debt Instrument, Interest Rate, Stated Percentage 5.37%    
Short-term Debt, Total   $ 55,105  
Line of Credit Facility, Expiration Date May 16, 2019