CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (USD $) In Thousands, unless otherwise specified	Common Stock	Additional paid-in capital	Retained earnings	Treasury stock	Accumulated other comprehensive income (loss)	Total
Balance at Dec. 31, 2009	$ 334	$ 73,360	$ 3,959			$ 77,653
Balance (in shares) at Dec. 31, 2009	33,435
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of restricted shares	2	(2)
Issuance of restricted shares (in shares)	205
Employee stock purchase plan		11				11
Employee stock purchase plan (in shares)	11
Share-based compensation		533				533
Other comprehensive income (loss)					12	12
Net earnings for the year			2,070			2,070
Balance at Dec. 31, 2010	336	73,902	6,029		12	80,279
Balance (in shares) at Dec. 31, 2010	33,651
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of restricted shares	3	(3)
Issuance of restricted shares (in shares)	298
Restricted shares retired		(14)				(14)
Restricted shares retired (in shares)	(8)
Employee stock purchase plan	1	61				62
Employee stock purchase plan (in shares)	50
Share-based compensation		759				759
Other comprehensive income (loss)					(28)	(28)
Net earnings for the year			3,064			3,064
Balance at Dec. 31, 2011	340	74,705	9,093		(16)	84,122
Balance (in shares) at Dec. 31, 2011	33,991					33,991
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchase of common stock				(10,382)		(10,382)
Issuance of restricted shares	7	(7)
Issuance of restricted shares (in shares)	785
Employee stock purchase plan	1	71				72
Employee stock purchase plan (in shares)	53
Share-based compensation		939				939
Other comprehensive income (loss)					37	37
Net earnings for the year			2,139			2,139
Balance at Dec. 31, 2012	$ 348	$ 75,708	$ 11,232	$ (10,382)	$ 21	$ 76,927
Balance (in shares) at Dec. 31, 2012	34,829					34,829