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Shareholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2017
Shareholders' Equity [Abstract]  
Schedule of stock option activity and related information

   2017  2016  2015 
   Number of options  

Weighted-

average exercise price

  Number of options  Weighted average exercise price  Number of options  

Weighted-

average exercise price

 
                    
 Outstanding - beginning of year  252,670  $6.21   238,894  $6.65   136,256  $9.62 
 Changes during the year:                        
 Granted  75,000  $2.13   30,000  $2.13   109,625  $2.78 
 Exercised  -  $-   (10,000) $2.96   -  $- 
 Forfeited  (13,545) $49.09   (6,224) $8.56   (6,987) $12.49 
                          
 Outstanding - year end  314,125  $3.39   252,670  $6.21   238,894  $6.65 
                          
 Vested and expected to vest  192,584  $4.10   154,333  $8.44   88,766  $12.47 
 Exercisable at year end  182,584  $4.17   144,333  $8.82   88,766  $12.47
Schedule of options granted to employees and directors
            Weighted average 
    Options  Weighted  Options  Remaining 
    outstanding  average  exercisable  Contractual 
    as of  remaining  as of  life of options 
 Exercise  December 31,  contractual  December 31,  exercisable 
 Price  2017  life (years)  2017  (years) 
               
  2.126   30,000   3.86   10,002   3.86 
  2.131   75,000   4.93   -   - 
  2.237   26,625   2.81   17,749   - 
  2.96   73,000   2.38   45,333   3.38 
  3.88   375   1.88   375   1.88 
  3.88   90,000   0.85   90,000   0.85 
  4.02   5,000   1.54   5,000   1.54 
  6.67   10,000   1.28   10,000   1.28 
  6.67   375   1.28   375   1.28 
  33.60   3,750   0.23   3,750   0.23 
                    
  Grand Total   314,125   2.65   182,584   1.63