Consolidated Balance Sheets (Parenthetical) (USD $)	Sep. 30, 2011	Sep. 30, 2010
Current assets:
Allowance for doubtful accounts	$ 44,595	$ 54,048
Property, plant and equipment:
Accumulated amortization of intangible assets	3,682,633	2,747,745
Accumulated amortization of patents	$ 1,328,486	$ 1,268,907
Shareholders' equity:
Common stock, par value
Common stock, shares authorized	40,000,000	40,000,000
Common stock, shares issued	12,141,817	12,072,452
Common stock, shares outstanding	12,141,817	12,072,452