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Note 12 - Operating Lease Liability (Details) - USD ($)
3 Months Ended 6 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Mar. 31, 2019
Note 12 - Operating Lease Liability (Details) [Line Items]          
Operating Leases, Future Minimum Payments Due         $ 768,475
Lessee, Operating Lease, Discount Rate 6.25%   6.25%    
Operating Leases, Rent Expense $ 171,618 $ 180,927 $ 83,824 $ 94,229  
Building [Member]          
Note 12 - Operating Lease Liability (Details) [Line Items]          
Operating Leases, Future Minimum Payments Due 18,467   18,467    
Equipment [Member]          
Note 12 - Operating Lease Liability (Details) [Line Items]          
Operating Leases, Future Minimum Payments Due $ 523   $ 523