Note 6 - Stock-based Compensation (Details Textual) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures			60,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	$ 26,375		$ 26,375
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period			62,000
Proceeds from Stock Options Exercised			$ 11,350	$ 350
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value	$ 63,250		$ 63,250
Restricted Stock [Member]
Share Price	$ 0.46		$ 0.46
Allocated Share-based Compensation Expense	$ 3,572	$ 6,211	$ 636	$ 1,250