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Stock Options (Tables)
 12 Months Ended
Dec. 31, 2017
Stock Options [Abstract]  
Schedule of information about stock options

  Number of
options		  Weighted
average
exercise
price		  Weighted
average
contractual
term 
(years)		  Aggregate
intrinsic
value		 
Outstanding at January 1, 2016  406,700  $8.50         
Granted  70,700   5.70         
Forfeited  (40,800)  6.70         
Exercised  (25,000) 1.70         
Outstanding at December 31, 2016  411,600  8.63         
Granted  106,000   4.24         
Forfeited  (16,700)  6.01         
Expired  (160,000)  12.50         
Exercised  (5,000)  3.00         
Outstanding at December 31, 2017  335,900  $5.61   7.19  $52,500 
Vested and exercisable at December 31, 2017  212,500  $6.27   6.01  $52,500 
Vested and exercisable at December 31, 2017 and expected to vest thereafter  331,600  $5.61   7.19  $52.500 
Schedule of option input into a Black Scholes option pricing model
  2016  2017 
Exercise price $4.90 to $6.60  $4.02 to$ 5.25 
Expected life  5.5 years   5.8 years 
Expected volatility  38%  38%
Dividend yield  0%  0%
Risk-free interest rate  1.13% to 1.73%  1.89% to 2.06%