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Note 8 - Line of Credit (Details) - Line of Credit [Member] - USD ($)
1 Months Ended 6 Months Ended
Mar. 31, 2017
Sep. 30, 2017
Note 8 - Line of Credit (Details) [Line Items]    
Line of Credit Facility, Expiration Date Mar. 31, 2018  
Line of Credit Facility, Maximum Borrowing Capacity $ 1,000,000  
Line of Credit Facility, Interest Rate at Period End   4.985%
Proceeds from Lines of Credit   $ 800,000
Long-term Line of Credit $ 200,000 $ 1,000,000
London Interbank Offered Rate (LIBOR) [Member]    
Note 8 - Line of Credit (Details) [Line Items]    
Debt Instrument, Basis Spread on Variable Rate 3.75%