Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)	Jun. 30, 2017	Dec. 31, 2016
Condensed Consolidated Balance Sheets [Abstract]
Allowance for doubtful accounts receivable, current	$ 42,000	$ 30,000
Preferred stock, par value per share	$ 0.001	$ 0.001
Preferred stock, shares authorized	2,000,000	2,000,000
Preferred stock, shares issued	0	0
Common stock, par value per share	$ 0.01	$ 0.01
Common stock, shares authorized	10,000,000	10,000,000
Common stock, shares issued	3,926,491	3,926,491
Common stock, shares outstanding	2,820,999	2,816,639
Treasury stock, shares	1,105,492	1,109,852