Consolidated Balance Sheets (unaudited) (Parenthetical) (USD $)	Sep. 30, 2012	Dec. 31, 2011
Current assets:
Reserves for accounts receivable	$ 155,000	$ 150,000
Shareholders' equity:
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, authorized shares (in shares)	40,000,000	40,000,000
Common stock, shares issued (in shares)	16,316,369	16,378,205
Common stock, shares outstanding (in shares)	16,316,369	16,378,205