Annual report pursuant to Section 13 and 15(d)

Stock options and warrants (Other common stock purchase options and warrants) (Narrative) (Details)

v3.7.0.1
Stock options and warrants (Other common stock purchase options and warrants) (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation, operating expense $ 545,549 $ 1,143,078
Nonqualified [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Awards outstanding 527,003 432,003
Options granted 95,000  
Options granted, exercise price $ 3.78  
Nonqualified [Member] | Non Compensatory Rights [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Exercise price of warrants $ 15.40  
Awards outstanding 429,503  
Nonqualified [Member] | Compensatory Arrangements [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Exercise price of warrants $ 4.38  
Awards outstanding 97,500  
Nonqualified [Member] | Employees [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options granted 95,000  
Options granted, exercise price $ 3.78  
Share-based compensation, operating expense $ 56,000  
Vesting period 2 years  
Percent of shares vesting on the six month anniversary from grant date 50.00%  
Expiration period 10 years  
Unrecognized compensation expense $ 157,000  
Unrecognized compensation cost, period for recognition 1 year