Note 14 - Income Taxes - Components of Income Tax Expense (Benefit) (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Federal									$ 131,936	$ 53,145	$ 158,837
State									112,566
									244,502	53,145	158,837
Federal									2,500,785	1,493,055	816,263
State									215,852	291,129	373,909
									2,716,637	1,784,184	1,190,172	[1]
Total	$ 775,000	$ 948,000	$ 664,000	$ 574,000	$ 484,000	$ 610,000	$ 486,000	$ 257,000	$ 2,961,139	$ 1,837,329	$ 1,349,009	[2]

[1] revised for prior period restatement

[2] revised for prior period restatement