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Note 8 - Line of Credit (Details) - Line of Credit [Member] - USD ($)
1 Months Ended 3 Months Ended
Jul. 31, 2017
Mar. 31, 2017
Jun. 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   4.974%  
Proceeds from Lines of Credit     $ 200,000
Long-term Line of Credit   $ 200,000 400,000
Line of Credit Facility, Remaining Borrowing Capacity     $ 600,000
London Interbank Offered Rate (LIBOR) [Member]      
Note 8 - Line of Credit (Details) [Line Items]      
Debt Instrument, Basis Spread on Variable Rate   3.75%  
Subsequent Event [Member]      
Note 8 - Line of Credit (Details) [Line Items]      
Proceeds from Lines of Credit $ 200,000