CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Current assets:
Accounts receivable, allowances for bad debts and customer credits	$ 1,015	$ 1,045
Stockholders' equity:
Common stock, par value (in dollars per share)	$ .001	$ .001
Common stock, authorized (in shares)	55,000,000	55,000,000
Common stock, issued (in shares)	11,012,625	10,626,624
Common stock, outstanding (in shares)	11,012,625	10,626,624
Series A Preferred Stock [Member]
Stockholders' equity:
Preferred stock, par value (in dollars per share)	$ .001	$ .001
Preferred stock, authorized (in shares)	11,445,187	11,445,187
Preferred stock, issued (in shares)	0	0
Preferred stock, outstanding (in shares)	0	0
Series B Preferred Stock [Member]
Stockholders' equity:
Preferred stock, par value (in dollars per share)	$ .001	$ .001
Preferred stock, authorized (in shares)	500,000	500,000
Preferred stock, issued (in shares)	168,007	168,007
Preferred stock, outstanding (in shares)	168,007	168,007