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Note 8 - Long-Term Debt (Details) - Notes Payable to Banks [Member] - Note to Bank #1 [Member] - USD ($)
1 Months Ended
Jul. 31, 2015
Jun. 30, 2018
Mar. 31, 2018
Note 8 - Long-Term Debt (Details) [Line Items]      
$ 18,000    
Debt Instrument, Maturity Date, Description July 2018    
Debt Instrument, Term 3 years    
Debt Instrument, Frequency of Periodic Payment Monthly    
Debt Instrument, Periodic Payment $ 536    
Debt Instrument, Interest Rate, Stated Percentage 4.50%    
Debt Instrument, Collateral collateralized by substantially all of the assets of the Company    
Notes Payable   $ 534 $ 2,124