Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($)	Mar. 31, 2017	Dec. 31, 2016
Convertible notes payable, debt issuance costs	$ 144,968	$ 144,968
Convertible notes payable, debt discount	$ 145,949	$ 145,949
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	50,000,000	50,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	50,000,000	50,000,000
Common stock, shares issued (in shares)	19,221,970	19,165,152
Common stock, shares outstanding (in shares)	19,178,346	19,121,528
Treasury shares (in shares)	43,624	43,624
Convertible Notes Payable, Related Party [Member]
Convertible notes payable, debt issuance costs	$ 594,029	$ 594,029
Convertible notes payable, debt discount	$ 247,710	$ 247,710