Condensed Consolidated Balance Sheets (Unaudited) (Parentheticals) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Allowance for doubtful trade receivables	$ 102	$ 918
Unamortized debt issuance costs, current	7	7
Unamortized debt issuance costs, long-term	$ 23	$ 29
Common stock, par value (in dollars per share)	$ 0	$ 0
Common stock, shares authorized	75,000,000	75,000,000
Common stock, shares issued	31,129,000	31,005,000
Common stock, shares outstanding	31,129,000	31,005,000