Note 8 - Provision for Income Taxes (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current provision:
Federal	$ 3,045,292	$ 3,368,974	$ 2,982,023
State	482,186	548,225	527,042
	3,527,478	3,917,199	3,509,065
Deferred provision (benefit):
Federal	212,563	210,343	399,032
State	76,607	(26,853)	46,945
	289,170	183,490	445,977
	$ 3,816,648	$ 4,100,689	$ 3,955,042