Income Taxes (Deferred Tax Assets and Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Sep. 30, 2011
Deferred Tax Assets
Operating loss carryforward	$ 1,919	$ 872
Accounts receivable allowance	106	72
Warrants	0	202
Texas tax credit carryforward	228	232
Stock option compensation	1,306	1,206
Goodwill	723	843	1,500
Accrued expenses	121	195
Alternative Minimum Tax credit carryforwards	16	16
Total deferred tax assets	4,419	3,638
Deferred Tax Liabilities
Property and equipment	(514)	(570)
Prepaid expense	(80)	(84)
Total deferred tax liabilities	(594)	(654)
Valuation allowance	(3,597)	(2,752)
Net deferred tax assets	$ 228	$ 232