Note 9 - Reconciliation of Federal Income Tax (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Income tax expense (benefit) at 34%	$ 361,000	$ 770,000
Change in valuation allowance	93,000	(2,610,000)
Permanent and other differences	(454,000)	220,000
Alternative minimum tax and Texas margin tax	75,285	137,774
Income tax expense (benefit)	$ 75,285	$ (1,482,226)