Condensed Consolidated Balance Sheets (Unaudited) (Parentheticals) (USD $) In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Statement of Financial Position [Abstract]
Allowance for doubtful trade receivables	$ 38	$ 53
Common stock, par value (in dollars per share)	$ 0	$ 0
Common stock, shares authorized	75,000	75,000
Common stock, shares issued	31,188	31,162
Common stock, shares outstanding	31,188	31,162