Quarterly report pursuant to Section 13 or 15(d)

Stock based compensation, options and warrants (Schedule of Award Activity) (Details)

v3.7.0.1
Stock based compensation, options and warrants (Schedule of Award Activity) (Details) - USD ($)
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Stock Incentive Plan [Member]    
Shares Underlying Options    
Outstanding, beginning 566,747  
Granted  
Exercised  
Forfeited (14,836) (7,382)
Outstanding, ending 551,911  
Exercisable 472,911  
Weighted Average Exercise Price    
Outstanding, beginning $ 20.46  
Granted  
Exercised  
Forfeited 42.86  
Outstanding, ending 19.85  
Exercisable $ 22.68  
Weighted Average Remaining Contractual Term    
Outstanding 7 years 1 month 6 days  
Exercisable 6 years 8 months 12 days  
Aggregate Intrinsic Value    
Outstanding $ 270,636  
Exercisable $ 184,486  
Nonqualified [Member]    
Shares Underlying Options    
Outstanding, beginning 527,003  
Granted 400,000  
Exercised  
Forfeited (30,000)  
Outstanding, ending 897,003  
Exercisable 464,503  
Weighted Average Exercise Price    
Outstanding, beginning $ 13.36  
Granted 3.50  
Exercised  
Forfeited 3.78  
Outstanding, ending 9.29  
Exercisable $ 15.47  
Weighted Average Remaining Contractual Term    
Outstanding 2 years 6 months  
Exercisable 1 year  
Aggregate Intrinsic Value    
Outstanding $ 214,300  
Exercisable $ 7,150