Note 8 - Stockholders' Equity (Details Textual) - USD ($)	1 Months Ended	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2017	Mar. 31, 2016
Stock Issued During Period, Shares, Warrants Exercised	983,334
Proceeds from Warrant Exercises	$ 49,167
General and Administrative Expense		$ 292,667	$ 906,505
Expense Associated with Warrant Modifications [Member]
General and Administrative Expense			469,799
2006 Equity Incentive Plan [Member]
Allocated Share-based Compensation Expense		14,580	$ 13,686
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	$ 117,404	$ 117,404
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition		2 years 109 days