Note 13 - Quarterly Results of Operations (Unaudited) (Detail) - Summary of Quarterly Results of Operations (USD $)	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Fiscal year ended 2012
Net sales and service income	$ 35,216,403	$ 38,079,530	$ 47,306,130
Gross profit	10,361,443	11,550,848	14,455,606
Net income (loss)	1,250,492	2,536,307	4,186,449
Basic earnings (loss) per common share (in Dollars per share)	$ 0.12	$ 0.25	$ 0.41
Diluted earnings (loss) per common share (in Dollars per share)	$ 0.12	$ 0.25	$ 0.41
First Quarter [Member]
Fiscal year ended 2012
Net sales and service income	9,004,395	9,229,446	10,219,221
Gross profit	2,739,021	2,879,565	3,330,340
Net income (loss)	446,780	740,635	859,639
Basic earnings (loss) per common share (in Dollars per share)	$ 0.04	$ 0.07	$ 0.08
Diluted earnings (loss) per common share (in Dollars per share)	$ 0.04	$ 0.07	$ 0.08
Second Quarter [Member]
Fiscal year ended 2012
Net sales and service income	9,230,956	8,896,705	12,055,521
Gross profit	2,527,319	2,684,710	3,619,796
Net income (loss)	(76,279)	598,706	1,081,845
Basic earnings (loss) per common share (in Dollars per share)	$ (0.01)	$ 0.06	$ 0.11
Diluted earnings (loss) per common share (in Dollars per share)	$ (0.01)	$ 0.06	$ 0.11
Third Quarter [Member]
Fiscal year ended 2012
Net sales and service income	8,498,773	8,695,205	13,297,449
Gross profit	2,587,836	2,567,397	4,207,974
Net income (loss)	459,298	467,577	1,396,234
Basic earnings (loss) per common share (in Dollars per share)	$ 0.05	$ 0.05	$ 0.14
Diluted earnings (loss) per common share (in Dollars per share)	$ 0.05	$ 0.05	$ 0.14
Fourth Quarter [Member]
Fiscal year ended 2012
Net sales and service income	8,482,279	11,258,174	11,733,939
Gross profit	2,507,267	3,419,176	3,297,496
Net income (loss)	$ 420,693	$ 729,389	$ 848,731
Basic earnings (loss) per common share (in Dollars per share)	$ 0.04	$ 0.07	$ 0.08
Diluted earnings (loss) per common share (in Dollars per share)	$ 0.04	$ 0.07	$ 0.08