Consolidated Balance Sheets (Parentheticals) - $ / shares shares in Thousands	Dec. 31, 2018	Dec. 31, 2017
Preferred stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Preferred stock, shares authorized (in shares)	1,000	1,000
Preferred stock, shares issued (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	49,000	49,000
Common stock, shares issued (in shares)	17,520	16,316
Common stock, shares outstanding (in shares)	16,743	15,547
Treasury stock, shares (in shares)	777	769