Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current Assets:
Allowance for doubtful accounts	$ 246	$ 208
Allowance for reserve	$ 39	$ 39
Stockholders' equity
Common stock, par value (usd per share)	$ 0.01	$ 0.01
Common stock, shares authorized	8,000,000	8,000,000
Common stock, shares issued	5,225,648	5,214,148
Common stock, shares outstanding	5,080,395	5,047,895
Treasury stock, at cost	40,920	40,920
Preferred stock, par value (usd per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares outstanding	0	0