Note 7 - Contributions to 401(k) Plan (Details) - USD ($)		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Maximum Matching Contribution per Participant*	[1]	$ 10,600	$ 10,400	$ 10,200
Total Matching Contribution		$ 290,388	$ 286,224	$ 301,434

[1] Due to the annual limit on eligible earnings imposed by the Internal Revenue Code