Income Taxes (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Current:
Federal	$ 3,034,000	$ 3,266,000	$ 3,825,000
State	943,000	934,000	1,011,000
Current income tax expense (benefit)	3,977,000	4,200,000	4,836,000
Deferred:
Federal	(174,000)	(306,000)	(133,000)
State	(144,000)	(83,000)	48,000
Deferred income tax expense (benefit)	(318,000)	(389,000)	(85,000)
Total
Total income taxes	3,659,000	3,811,000	4,751,000
Reconciliation of the effective income tax rate with the applicable statutory federal income tax rate
Federal tax at statutory rate (as a percent)	34.00%	34.00%	35.00%
State taxes, net of federal benefit (as a percent)	5.80%	5.80%	5.70%
Other (as a percent)	3.40%	1.80%	0.60%
Effective income tax rate (as a percent)	43.20%	41.60%	41.30%
Deferred income tax assets:
Point loyalty program	800,000	814,000
Accrued expenses	3,087,000	2,152,000
Other	577,000	725,000
Total deferred income tax assets	4,464,000	3,691,000
Deferred income tax liabilities:
Depreciation - property and equipment	(5,174,000)	(5,675,000)
Total deferred income tax liabilities	(5,174,000)	(5,675,000)
Net deferred income tax liabilities	(710,000)	(1,984,000)
Amounts recognized in the consolidated balance sheet:
Current deferred income tax assets	1,284,000	1,317,000
Noncurrent deferred income tax liabilities	(1,994,000)	(3,301,000)
Net deferred income tax liabilities	$ (710,000)	$ (1,984,000)