Quarterly Financial Data (Unaudited) (Details) - USD ($)	3 Months Ended								12 Months Ended
	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2015	Sep. 30, 2014
Quarterly Financial Information Disclosure [Abstract]
Revenue	$ 16,990,000	$ 16,781,000	$ 15,893,000	$ 15,682,000	$ 15,579,000	$ 15,692,000	$ 14,745,000	$ 14,477,000	$ 65,346,000	$ 60,493,000
Gross Profit	3,387,000	3,038,000	2,730,000	2,533,000	2,340,000	2,308,000	2,199,000	2,112,000	11,688,000	8,959,000
Operating income	958,000	763,000	515,000	259,000	205,000	268,000	225,000	66,000	2,496,000	764,000
Other income (expense), net (2)	1,466,000	(34,000)	(651,000)	(36,000)	(27,000)	(17,000)	(27,000)	67,000	744,000	(4,000)
Income before income taxes	2,424,000	729,000	(136,000)	223,000	178,000	251,000	198,000	133,000	3,240,000	760,000
Income Tax Expense (Benefit)	5,814,000	(292,000)	54,000	(89,000)	4,597,000	(0.00)	(0.00)	(0.00)	5,488,000	4,597,000
Net income	$ 8,238,000	$ 437,000	$ (82,000)	$ 134,000	$ 4,775,000	$ 251,000	$ 198,000	$ 133,000	$ 8,728,000	$ 5,357,000
Net income (loss) per share - basic (dollars per share)	$ 0.86	$ 0.05	$ (0.01)	$ 0.01	$ 0.50	$ 0.03	$ 0.02	$ 0.01	$ 0.91	$ 0.56
Net income (loss) per share - diluted (dollars per share)	$ 0.82	$ 0.04	$ (0.01)	$ 0.01	$ 0.48	$ 0.03	$ 0.02	$ 0.01	$ 0.87	$ 0.54