Balance Sheets (Parenthetical) (USD $)	Sep. 30, 2011	Sep. 30, 2010
Current assets:
Allowance for doubtful accounts	$ 155,000	$ 639,000
Stockholders' equity:
Preferred stock, par value	$ 1.00	$ 1.00
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares outstanding
Common stock, par value	$ 0.33	$ 0.33
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	7,910,885	7,902,106
Common stock, shares outstanding	7,910,885	7,902,106