XML 66 R36.htm IDEA: XBRL DOCUMENT v3.8.0.1
Stock Options (Details) - Stock option [Member] - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of options, Outstanding 411,600 406,700
Number of options, Granted 106,000 70,700
Number of options, Forfeited (16,700) (40,800)
Number of options, Expired (160,000)  
Number of options, Exercised (5,000) (25,000)
Number of options, Outstanding 335,900 411,600
Number of options, vested and exercisable 212,500  
Number of options, vested and exercisable expected to vest thereafter 331,600  
Weighted average exercise price, Balance $ 8.63 $ 8.50
Weighted average exercise price, Granted 4.24 5.70
Weighted average exercise price, Forfeited 6.01 6.70
Weighted average exercise price, Expired 12.50  
Weighted average exercise price, Exercised 3.00 1.70
Weighted average exercise price, Balance 5.61 $ 8.63
Weighted average exercise price vested and exercisable 6.27  
Weighted average exercise price, vested and exercisable expected to vest thereafter $ 5.61  
Weighted average contractual term (years) 7 years 2 months 8 days  
Weighted average contractual term, vested and exercisable (years) 6 years 4 days  
Weighted average contractual term, vested and exercisable expected to vest thereafter (years) 7 years 2 months 8 days  
Aggregate intrinsic value, Outstanding $ 52,500  
Aggregate intrinsic value, vested and exercisable 52,500  
Aggregate intrinsic value, vested and exercisable expected to vest thereafter $ 52,500