Note 9 - Income Taxes - Components of Income Taxes (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Current:
Federal	$ 240,924	$ 383,178
State	9,000	9,780
Total current provision	249,924	392,958
Deferred:
Federal	(2,154)	291,174
State
Total deferred (benefit)/provision	(2,154)	291,174
Income tax expense	$ 247,770	$ 684,132