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Note 9 - Line of Credit (Details) - USD ($)
1 Months Ended 3 Months Ended
Mar. 31, 2017
Jun. 30, 2018
Jun. 30, 2017
Mar. 31, 2018
Note 9 - Line of Credit (Details) [Line Items]        
Repayments of Lines of Credit   $ 50,000 $ 0  
Line of Credit [Member]        
Note 9 - 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   5.83%    
Repayments of Lines of Credit   $ 50,000    
Long-term Line of Credit   950,000   $ 1,000,000
Line of Credit Facility, Remaining Borrowing Capacity   $ 0    
London Interbank Offered Rate (LIBOR) [Member] | Line of Credit [Member]        
Note 9 - Line of Credit (Details) [Line Items]        
Debt Instrument, Basis Spread on Variable Rate 3.75%