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Statements Of Shareholders' Equity (USD $)
Common Stock [Member]
Additional Paid-In Capital [Member]
Retained Earnings (Accumulated Deficit) [Member]
Total
Balances at Dec. 31, 2008 $ 151,000 $ 31,881,000 $ (24,761,000) $ 7,271,000
Balances, shares at Dec. 31, 2008 15,069,000      
Issuance of common stock, net 1,000 160,000   161,000
Issuance of common stock, shares 112,000      
Value of stock-based compensation   537,000   537,000
Net income     3,716,000 3,716,000
Balances at Dec. 31, 2009 152,000 32,578,000 (21,045,000) 11,685,000
Balances, shares at Dec. 31, 2009 15,181,000      
Issuance of common stock, net 8,000 727,000   735,000
Issuance of common stock, shares 751,000      
Repurchase of common stock, net (1,000) (468,000)   (469,000)
Repurchase of common stock, shares (85,000)      
Value of stock-based compensation   711,000   711,000
Net income     6,596,000 6,596,000
Balances at Dec. 31, 2010 159,000 33,548,000 (14,449,000) 19,258,000
Balances, shares at Dec. 31, 2010 15,847,000      
Issuance of common stock, net 15,000 3,111,000   3,126,000
Issuance of common stock, shares 1,556,000      
Repurchase of common stock, net (38,000) (17,331,000)   (17,369,000)
Repurchase of common stock, shares (3,773,000)      
Value of stock-based compensation   721,000   721,000
Dividends paid     (31,335,000) (31,335,000)
Excess tax benefit from stock options   2,369,000   2,369,000
Net income     51,089,000 51,089,000
Balances at Dec. 31, 2011 $ 136,000 $ 22,418,000 $ 5,305,000 $ 27,859,000
Balances, shares at Dec. 31, 2011 13,630,000