Quarterly Financial Data (unaudited): (Details) (USD $)	3 Months Ended								12 Months Ended
	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Quarterly Financial Data (unaudited):
Net Sales	$ 6,928,026	$ 6,134,492	$ 6,760,221	$ 4,755,459	$ 6,490,277	$ 5,971,494	$ 6,746,070	$ 6,529,811	$ 24,578,198	$ 25,737,652	$ 25,257,323
Cost of sales	4,259,701	3,518,867	3,659,505	2,629,860	3,324,155	2,811,960	2,873,414	2,935,655	14,067,933	11,945,184	11,520,029
Gross profit	2,668,325	2,615,625	3,100,716	2,125,599	3,166,122	3,159,534	3,872,656	3,594,156	10,510,265	13,792,468	13,737,294
Operating income (loss)	373,006	355,162	346,543	(658,199)	94,956	(104,935)	466,686	151,200	416,512	607,907	403,467
Net income (loss)	$ 2,773,129	$ 259,971	$ 288,873	$ (342,979)	$ 11,639	$ (78,981)	$ 499,152	$ 284,780	$ 2,978,994	$ 716,590	$ 748,376
Net income (loss) per common share
Basic (in dollars per share)	$ 0.17	$ 0.02	$ 0.02	$ (0.02)	$ 0.00	$ 0.00	$ 0.03	$ 0.02	$ 0.18	$ 0.04	$ 0.04
Diluted (in dollars per share)	$ 0.17	$ 0.02	$ 0.02	$ (0.02)	$ 0.00	$ 0.00	$ 0.03	$ 0.02	$ 0.18	$ 0.04	$ 0.04