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Supplemental disclosure of non-cash operating and financing activities: - USD ($)
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
May 2015 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 10,500  
Shares Issued, Price Per Share $ 4.88  
Sale of Stock, Price Per Share $ 4.98  
Stock Issued During Period, Shares, Other 210  
Common Stock Offering [Member]    
Warrants Authorized For Issuance To Acquire Common Stock Shares Number   20,313
Warrants Authorized For Issuance To Acquire Common Stock Value   $ 92,000