Annual report pursuant to Section 13 and 15(d)

Income taxes (Reconciliation of Income Taxes) (Details)

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Income taxes (Reconciliation of Income Taxes) (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]    
Statutory rate 34.00% 34.00%
Federal income tax benefit at 34% $ (1,453,000) $ (2,978,000)
State income tax net of federal tax effect (128,000) (263,000)
Permanent items 259,000 424,000
Other (20,000) (15,000)
Valuation allowance 1,342,000 2,832,000
Income Taxes