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Shareholders' Equity - Price Range (Details) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Options Outstanding    
Number Outstanding (in shares) 895,161  
Weighted Average Remaining Contractual Life 7 years 22 days  
Weighted Average Exercise Price Per Share $ 2.73  
Options Exercisable    
Number Exercisable (in shares) 653,840 710,598
Weighted Average Exercise Price Per Share $ 2.66  
Stock option disclosures    
Aggregate intrinsic value of options outstanding (in dollars) $ 404,000  
Weighted average remaining life of options exercisable 6 years 5 months 12 days  
Aggregate intrinsic value of options exercisable (in dollars) $ 395,000  
Weighted average grant-date fair value of options granted (in dollars per share) $ 0.94 $ 1.13
Restricted stock units    
Number of Shares    
Outstanding at the beginning of the period (in shares) 25,000  
Granted (in shares) 99,000 25,000
Vested ( in shares) (8,334)  
Forfeited or surrendered (in shares) (27,000)  
Outstanding at the end of the period (in shares) 88,666 25,000
Weighted average grant date fair value    
Beginning balance fair value (per share) $ 3.03  
Granted (per share) 2.71 $ 3.03
Vested (per share) 3.03  
Forfeited or surrendered (per share) 2.89  
Ending balance fair value (per share) 2.72 $ 3.03
$1.61 - $2.46    
Range of Exercise Prices    
Lower (in dollars per share) 1.61  
Upper (in dollars per share) $ 2.46  
Options Outstanding    
Number Outstanding (in shares) 363,997  
Weighted Average Remaining Contractual Life 6 years 6 months 26 days  
Weighted Average Exercise Price Per Share $ 1.78  
Options Exercisable    
Number Exercisable (in shares) 352,331  
Weighted Average Exercise Price Per Share $ 1.76  
$2.79 - $4.22    
Range of Exercise Prices    
Lower (in dollars per share) 2.79  
Upper (in dollars per share) $ 4.22  
Options Outstanding    
Number Outstanding (in shares) 480,164  
Weighted Average Remaining Contractual Life 7 years 8 months 23 days  
Weighted Average Exercise Price Per Share $ 3.16  
Options Exercisable    
Number Exercisable (in shares) 250,509  
Weighted Average Exercise Price Per Share $ 3.35  
$5.49    
Range of Exercise Prices    
Exercise price (in dollars per share) $ 5.49  
Options Outstanding    
Number Outstanding (in shares) 51,000  
Weighted Average Remaining Contractual Life 4 years 4 months 28 days  
Weighted Average Exercise Price Per Share $ 5.49  
Options Exercisable    
Number Exercisable (in shares) 51,000  
Weighted Average Exercise Price Per Share $ 5.49  
2013 Plan | Board of Directors    
Stock option disclosures    
Total number of shares granted to the Board of Directors (in shares) 37,233 29,701
Shares issue price (in dollars per share) $ 2.82 $ 3.03
Total value of shares issued $ 105,000 $ 90,000
2013 Plan | Restricted stock units    
Stock option disclosures    
Vesting period 2 years 3 months 18 days 3 years
Number of Shares    
Granted (in shares) 99,000 25,000
Weighted average grant date fair value    
Granted (per share) $ 2.71 $ 3.03