Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ in Thousands	Apr. 01, 2017	Dec. 31, 2016
Accounts receivable, allowance for doubtful accounts	$ 1,896	$ 1,992
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
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)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	45,000,000	45,000,000
Common stock, shares issued (in shares)	10,587,642	10,566,528
Common stock, shares outstanding (in shares)	10,587,642	10,566,528