Consolidated Condensed Statement of Stockholders' Equity and Comprehensive Income(Unaudited) (USD $) In Thousands	Total	Common Stock ClassA [Member]	Common Stock ClassB [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Accumluated Other Comprehensive Income [Member]	Retained Earnings [Member]
Balance at Dec. 31, 2010	$ 100,698	$ 140	$ 24	$ 90,842	$ (16,799)	$ 476	$ 26,015
Net loss	(809)						(809)
Other comprehensive income:
Unrealized gain on effective portion of fuel hedge, net of tax of $441	1,149					1,149
Comprehensive income	340					1,149	(809)
Reclassification of fuel hedge gain into statement of operations, net of income tax of $508	(1,322)					(1,322)
Issuance of restricted stock from treasury stock, net	(390)	2		(2,895)	2,503
Income tax benefit arising from restricted share vesting	432			432
Stock-based employee compensation expense	656			656
Balance at Jun. 30, 2011	$ 100,414	$ 142	$ 24	$ 89,035	$ (14,296)	$ 303	$ 25,206