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Stockholders' equity and earnings per share (Tables)
 6 Months Ended
Jun. 30, 2013
Equity [Abstract]  
Schedule of stock option activity summary
Stock option activity summary is presented in the table below:
               
Weighted-
  
               
average
  
         
Weighted-
    
Remaining
  
         
average
    
Contractual
  
   
Number of
    
Exercise
    
Term
  
   
Shares
    
Price
    
(years)
  
Outstanding at December 31, 2011
  
87,500
  
$
4.80
    
5.08
  
  Granted
  
—
    
—
    
—
  
  Cancelled
  
—
    
—
    
—
  
  Exercised
  
—
    
—
    
—
  
  Forfeited
  
—
    
—
    
—
  
  Expired
  
—
    
—
    
—
  
Outstanding and exercisable at December 31, 2012
  
87,500
    
4.80
    
4.08
  
  Granted
  
—
    
—
    
—
  
  Cancelled
  
—
    
—
    
—
  
  Exercised
  
—
    
—
    
—
  
  Forfeited
  
—
    
—
    
—
  
  Expired
  
—
    
—
    
—
  
Outstanding and exercisable at June 30, 2013
  
87,500
  
$
4.80
    
3.83
  
Schedule of fair value assumptions
The fair value of the options granted during 2011 was estimated at the date of grant using the Black-Scholes option-pricing model with the following assumptions:

Closing market price of stock on grant date
$3.11
Risk-free interest rate
2.43%
Dividend yield
0.00%
Volatility factor
50%
Expected life
2.5 years