Provision for income taxes (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
provision for income taxes Details
Provision (Benefit) at US Statutory Rate	$ 240,000	$ (149,000)
Alternative Minimum Tax	7,500
Depreciation and Amortization	(29,000)	(33,000)
Accrued Sales Allowance and Other Liabilities	(31,000)	67,000
Non-Deductible Stock Based Compensation	32,000	15,000
Other Differences	51,000	45,000
Increase (Decrease) in Valuation Allowance	(263,000)	$ 55,000
Income Tax Provision (Benefit)	$ 7,500