Note 9 - Income Taxes - Reconciliation of Federal Income Tax (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Income tax expense (benefit) at 34%	$ (407,000)	$ 361,000
Change in valuation allowance	331,000	93,000
Permanent and other differences	76,000	(454,000)
Alternative minimum tax and Texas margin tax	32,668	75,285
(Benefit) expense for income taxes	$ 32,668	$ 75,285