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Stock based compensation, options and warrants (Schedule of Award Activity) (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Stock Incentive Plan [Member]    
Shares Underlying Options    
Outstanding, beginning 119,533  
Granted 50,000  
Exercised (19,533)  
Forfeited  
Outstanding, ending 150,000 119,533
Exercisable 108,333  
Weighted Average Exercise Price    
Outstanding, beginning $ 9.02  
Granted 18.50  
Exercised 4.02  
Forfeited  
Outstanding, ending 12.83 $ 9.02
Exercisable $ 10.65  
Weighted Average Remaining Contractual Term    
Outstanding 9 years 8 months 12 days  
Exercisable 9 years 7 months 6 days  
Aggregate Intrinsic Value    
Outstanding  
Exercisable  
Other common stock purchase options and warrants [Member]    
Shares Underlying Options    
Outstanding, beginning 1,944,895  
Granted  
Exercised (113,009)  
Forfeited  
Outstanding, ending 1,831,886 1,944,895
Exercisable 1,831,886  
Weighted Average Exercise Price    
Outstanding, beginning $ 35.06  
Granted  
Exercised 3.50  
Forfeited  
Outstanding, ending 36.96 $ 35.06
Exercisable $ 36.96  
Weighted Average Remaining Contractual Term    
Outstanding 2 years 6 months 2 years 8 months 12 days
Exercisable 2 years 6 months  
Aggregate Intrinsic Value    
Outstanding $ 62,400 $ 6,135,000
Exercisable $ 62,400