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Shareholders' Equity (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2012
Class of Stock [Line Items]    
Shares issued of common stock (in shares)   51,070
Changes in common stock [Roll Forward]    
Balance   $ 126,781,000
Balance 125,659,000 125,659,000
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expiration date of plan   Dec. 06, 2011
Employee Stock Options [Member]
    
Changes in common stock [Roll Forward]    
Exercise of options (in shares)   4,167
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Term of expiry of plan   10 years
Compensation expense 2,000 2,000
Unrecognized compensation expense 0 0
Options [Roll Forward]    
Outstanding beginning balance (in shares)   2,318,399
Granted (in shares)   0
Forfeited (in shares)   (105,000)
Expired (in shares)   0
Exercised (in shares)   (4,167)
Outstanding ending balance (in shares) 2,209,232 2,209,232
Exercisable (in shares) 2,209,232 2,209,232
Weighted Average Exercise Price [Roll Forward]    
Beginning Balance (in dollars per share)   $ 3.94
Granted (in dollars per share)   $ 0
Forfeited (in dollars per share)   $ 4.39
Expired (in dollar per share)   $ 0
Exercised (in dollars per share)   $ 2.52
Ending Balance (in dollars per share) $ 3.92 $ 3.92
Exercisable (in dollars per share) $ 3.92 $ 3.92
Weighted Average Remaining Contractual Life - Years   4 years 6 months 11 days
Aggregate intrinsic value of options / warrants outstanding 0 0
Director Stock Options [Member]
    
Changes in common stock [Roll Forward]    
Exercise of options (in shares)   20,000
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Compensation expense 15,000 37,000
Unrecognized compensation expense 130,000 130,000
Options vested over period   60,000
Term of plan   3 years
Options vested immediately   10,000
Risk free interest rate, minimum (in hundredths)   1.13%
Risk free interest rate, maximum (in hundredths)   1.41%
Expected volatility rate, minimum (in hundredths)   62.75%
Expected volatility rate, maximum (in hundredths)   63.59%
Options [Roll Forward]    
Outstanding beginning balance (in shares)   210,000
Granted (in shares)   70,000
Forfeited (in shares)   0
Expired (in shares)   (120,000)
Exercised (in shares)   (20,000)
Outstanding ending balance (in shares) 140,000 140,000
Exercisable (in shares) 63,335 63,335
Weighted Average Exercise Price [Roll Forward]    
Beginning Balance (in dollars per share)   $ 3.10
Granted (in dollars per share)   $ 2.85
Forfeited (in dollars per share)   $ 0
Expired (in dollar per share)   $ 3.05
Exercised (in dollars per share)   $ 2.52
Ending Balance (in dollars per share) $ 3.10 $ 3.10
Exercisable (in dollars per share) $ 3.01 $ 3.01
Weighted Average Remaining Contractual Life - Years   8 years 6 months
Aggregate intrinsic value of options / warrants outstanding 0 0
Director Stock Options [Member] | Options vesting immediately [Member]
    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Term of expiry of plan   10 years
Maximum period allowed for expiry of options for board members no longer serving the board   1 year
Director Stock Options [Member] | Options vesting over a three year period [Member]
    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Term of expiry of plan   10 years
Maximum period allowed for expiry of options for board members no longer serving the board   1 year
Director Stock Options [Member] | Maximum [Member]
    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected life   6 years
Director Stock Options [Member] | Minimum [Member]
    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected life   5 years
Common Stock [Member]
    
Changes in common stock [Roll Forward]    
Balance   274,000
Balance (in shares)   27,409,908
2001 stock compensation plan   1,000
2001 stock compensation plan (in shares)   30,000
Expense of employee options vesting   0
Expense of outside director warrants vesting   0
Balance 275,000 275,000
Balance (in shares) 27,460,978 27,460,978
Common Stock [Member] | Employee Stock Options [Member]
    
Changes in common stock [Roll Forward]    
Exercise of options   0
Exercise of options (in shares)   1,070
Options [Roll Forward]    
Exercised (in shares)   (1,070)
Common Stock [Member] | Director Stock Options [Member]
    
Changes in common stock [Roll Forward]    
Exercise of options   0
Exercise of options (in shares)   20,000
Options [Roll Forward]    
Exercised (in shares)   (20,000)
Additional Paid-In Capital [Member]
    
Changes in common stock [Roll Forward]    
Balance   122,523,000
2001 stock compensation plan   95,000
Expense of employee options vesting   2,000
Expense of outside director warrants vesting   32,000
Balance 122,707,000 122,707,000
Additional Paid-In Capital [Member] | Employee Stock Options [Member]
    
Changes in common stock [Roll Forward]    
Exercise of options   0
Additional Paid-In Capital [Member] | Director Stock Options [Member]
    
Changes in common stock [Roll Forward]    
Exercise of options   $ 55,000