CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
CURRENT ASSETS:
Accounts receivable, allowance for doubtful accounts	$ 42,000	$ 52,000
STOCKHOLDERS' EQUITY:
Preferred stock, shares authorized (in shares)	10,000,000	10,000,000
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	12,318,570	12,026,847
Common stock, shares outstanding (in shares)	12,318,570	12,026,847