Note 9 - Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Income tax expense at federal statutory rate [34%]	$ 717,600
State taxes	6,455
Change in other accruals	5,639	(50,392)
Difference between tax and book depreciation	54,390	(26,586)
FAS 123R employee compensation	(36,032)	(55,642)
Domestic production activities deduction	(50,320)
Net operating loss	(13,600)
Provision for 2014 tax return true up		(71,070)
Income tax expense/(benefit)	$ 684,132	$ (203,690)