Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Senior revolving credit facility, interest payable current	$ 950	$ 0
Senior revolving credit facility, interest payable noncurrent	$ 822	$ 0
Preferred stock, par value (in dollars per share)	$ 0.005	$ 0.005
Preferred stock, shares authorized (in shares)	10,000,000	10,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.005	$ 0.005
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	70,088,783	55,642,829
Common stock, shares outstanding (in shares)	69,985,183	55,539,229
Treasury stock, shares (in shares)	103,660	103,660