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Shareholders' Equity (Details) (USD $)
 3 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2014
Employee Stock Options [Member]
Mar. 31, 2013
Employee Stock Options [Member]
Mar. 31, 2014
Director Stock Options [Member]
Mar. 31, 2013
Director Stock Options [Member]
Mar. 31, 2014
2001 Stock Compensation Plan [Member]
Mar. 31, 2013
2001 Stock Compensation Plan [Member]
Mar. 31, 2014
Common Stock [Member]
Mar. 31, 2014
Additional Paid-In Capital [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Shares issued of common stock (in shares)             0 15,000    
Changes in common stock [Roll Forward]                    
Balance $ 109,315,000 $ 109,057,000             $ 277,000 $ 123,510,000
Balance (in shares)                 27,735,878  
Exercise of employee stock options                 1,000 (35,000)
Exercise of employee stock options (in shares)                 22,264  
Exercise of outside director options                 0 8,000
Exercise of outside director options (in shares)                 7,372  
Expense of employee options vesting                 0 43,000
Expense of outside director options vesting                 0 16,000
Balance 109,315,000 109,057,000             278,000 123,542,000
Balance (in shares)                 27,765,514  
Options [Roll Forward]                    
Outstanding beginning balance (in shares)     2,500,949   146,000          
Granted (in shares)     0   0          
Forfeited (in shares)     0   0          
Expired (in shares)     0   0          
Exercised (in shares)     (62,684)   (13,334)          
Outstanding ending balance (in shares)     2,438,265   132,666          
Exercisable (in shares)     2,074,935   63,334          
Weighted Average Exercise Price [Roll Forward]                    
Beginning Balance (in dollars per share)     $ 3.60   $ 2.93          
Granted (in dollars per share)     $ 0   $ 0          
Forfeited (in dollars per share)     $ 0   $ 0          
Expired (in dollars per share)     $ 0   $ 0          
Exercised (in dollars per share)     $ 2.45   $ 2.72          
Ending Balance (in dollars per share)     $ 3.63   $ 2.96          
Exercisable (in dollars per share)     $ 3.89   $ 3.43          
Weighted Average Remaining Contractual Life - Years     3 years 10 months 2 days   7 years 9 months 29 days          
Aggregate intrinsic value of options outstanding     2,965,000   242,000          
Share-based compensation expense     43,000 16,000 16,000 16,000 0 41,000    
Total unrecognized expense for the option plan     327,000   74,000          
Weighted average remaining vesting period     2 years   1 year 6 months 7 days          
Intrinsic value of option exercised     $ 139,000   $ 28,000