Note 7 - Loans Payable (Details Textual) - USD ($)	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Debt Instrument, Debt Default, Amount	$ 9,675,000
Equipment Pledged as Collateral	11,000
Stock Issued During Period, Value, New Issues	$ 26,908
Individual Lenders [Member]
Stock Issued During Period, Shares, New Issues	16,400	0
Stock Issued During Period, Value, New Issues	$ 10,168

Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering.

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