Statements Of Shareholders' Equity (USD $)	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings (Accumulated Deficit) [Member]	Total
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 (loss)			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
Issuance of common stock, net	1,000	130,000		131,000
Issuance of common stock, shares	76,000
Repurchase of common stock, net	(1,000)	(212,000)		(213,000)
Repurchase of common stock, shares	(104,000)
Value of stock-based compensation		342,000		342,000
Net income (loss)			(1,624,000)	(1,624,000)
Balances at Dec. 31, 2012	$ 136,000	$ 22,678,000	$ 3,681,000	$ 26,495,000
Balances, shares at Dec. 31, 2012	13,602,000