CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($)	Jun. 30, 2019	Dec. 31, 2018
Current assets:
Accounts receivable, reserves allowance	$ 91,000	$ 92,000
Stockholders' deficit:
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Preferred stock, shares outstanding (in shares)	1,623,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	25,000,000	25,000,000
Common stock, shares issued (in shares)	3,691,000	3,659,000
Common stock, shares outstanding (in shares)	3,649,000	3,617,000
Treasury stock at cost (in shares)	42,000	42,000
Series A Convertible Preferred Stock [Member]
Stockholders' deficit:
Preferred stock, shares issued (in shares)	826,000	826,000
Preferred stock, shares outstanding (in shares)	826,000	826,000
Series B Convertible Preferred Stock [Member]
Stockholders' deficit:
Preferred stock, shares issued (in shares)	797,000	797,000
Preferred stock, shares outstanding (in shares)	797,000	797,000