CONDENSED BALANCE SHEETS (Parenthetical) - USD ($)	Sep. 30, 2023	Dec. 31, 2022
Current assets:
Accounts receivable, allowance	$ 30,000	$ 30,000
Stockholders' equity:
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, authorized (in shares)	5,000,000	5,000,000
Preferred stock, issued (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, authorized (in shares)	32,500,000	32,500,000
Common stock, issued (in shares)	10,722,401	10,722,401
Common stock, outstanding (in shares)	10,722,401	10,722,401