Note 9 - Retirement Savings Plan (Details Textual) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Defined Contribution Plan, Employer Matching Contribution, Percent of Match			100.00%		100.00%
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent			4.00%		4.00%
Defined Contribution Plan, Employer Discretionary Contribution Amount	$ 7,401	$ 7,021	$ 28,196	$ 21,735