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Stock Compensation (Tables)
 12 Months Ended
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of restricted stock award activities
        Weighted  
          Average  
          Grant Date  
    Shares     Share Price  
Restricted stock awards unvested at December 31, 2012     35,700     $ 16.21  
Granted     26,780       7.39  
Vested     (30,030 )     9.70  
Forfeited     -       -  
Restricted stock awards unvested at December 31, 2013     32,450     $ 14.96  
Granted     13,200       7.79  
Vested     (13,450 )     13.86  
Forfeited     (10,000 )     7.00  
Restricted stock awards unvested at December 31, 2014     22,200     $ 14.95  
Options [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of stock option activities
       Weighted 
     Weighted  Average 
  Shares  Average  Remaining 
  Under  Exercise  Contractual 
  Options  Price  Term (Years) 
Balance at December 31, 2012  30,160  $26.58     
Options granted  202,200  $14.58     
Options exercised  -         
Options forfeited  (40) $10.00     
Balance at December 31, 2013  232,320  $16.14   8.98 
Options granted  146,560   11.83     
Options exercised  -   -     
Options cancelled/forfeited  (11,800)  8.09     
Balance at December 31, 2014  367,080  $14.68   8.50 
Summary of assumptions used to value stock options granted using a Black-Scholes model
  2014  2013 
Risk-free interest rate  1.63%-2.84%   1.80%-2.89% 
Expected volatility  145%-151%   152%-166% 
Weighted average expected volatility  148%  163%
Expected term (years)  5.63-10.0   10.0 
Expected dividend yield  0%  0%
Summary of option outstanding and exercisable
Options Outstanding  Options Exercisable 
      Weighted Average        Weighted Average 
Range of  Options  Remaining  Range of  Options  Remaining 
Exercise Price  Outstanding  Contractual Life  Exercise Price  Exercisable  Contractual Life 
$7.00   5,000   7.39  $7.00   5,000   7.39 
$8.60   30,500   9.20  $8.60   7,625   9.20 
$10.00   9,320   8.06  $10.00   7,653   8.06 
$11.00   3,000   8.03  $11.00   1,500   8.03 
$12.10   30,500   9.36  $12.10   7,625   9.36 
$12.50   106,200   8.46  $12.50   58,509   8.43 
$12.55   20,000   9.39  $12.55   -   - 
$13.00   14,600   9.53  $13.00   3,650   9.53 
$13.45   2,000   9.48  $13.45   -   - 
$13.50   14,960   9.49  $13.50   -   - 
$13.75   6,000   9.68  $13.75   -   - 
$17.50   100,000   8.11  $17.50   50,000   8.11 
$22.50   5,000   6.62  $22.50   5,000   6.62 
$32.00   15,000   6.53  $32.00   15,000   6.53 
$34.50   5,000   6.56  $34.50   5,000   6.56 
     367,080           166,562     
Stock Compensation Plan [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of stock-based compensation
  2014  2013 
Cost of sales $-  $- 
Research and development  123   8 
Selling, general and administrative  1,568   1,327 
Total stock-based compensation $1,691  $1,335