CONSOLIDATED CONDENSED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Current assets:
Accounts receivable, allowances for bad debts and customer credits	$ 968	$ 1,015
Stockholders' equity:
Preferred stock, authorized (in shares)	11,445,187	11,445,187
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, authorized (in shares)	55,000,000	55,000,000
Common stock, issued (in shares)	11,062,688	11,012,625
Common stock, outstanding (in shares)	11,062,688	11,012,625
Preferred Class A [Member]
Stockholders' equity:
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, Issued (in shares)	0	0
Preferred stock, outstanding (in shares)	0.	0
Preferred Class B [Member]
Stockholders' equity:
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, Issued (in shares)	168,007	168,007
Preferred stock, outstanding (in shares)	168,007	168,007