CONSOLIDATED BALANCE SHEETS (Parentheticals) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Accounts receivable, allowance for doubtful accounts	$ 1,487	$ 1,246
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	30,000,000	30,000,000
Common stock, shares outstanding (in shares)	20,804,000	14,450,000
Treasury stock, shares (in shares)	293,000	268,000
Term Loan Current
Term loan, unamortized discount and prepaid costs	$ 2,133	$ 2,243
Term Loan Noncurrent
Term loan, unamortized discount and prepaid costs	$ 7,655	$ 4,579