Note 9 - Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income tax benefit at federal statutory rate [34%]			$ 2,075,004	$ (620,882)
Change in other accruals			90,781	(216,640)
Difference between tax and book depreciation			(201,847)	50,213
Stock-based compensation			(197,707)	(48,993)
Provision for tax return true up				(71,070)
Income tax expense/(benefit)	$ 508,316	$ (203,310)	$ 1,766,231	$ (907,372)