Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Trade accounts receivable, allowance	$ 1,208	$ 1,227
Accumulated depreciation	$ 2,484	$ 2,158
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, authorized (in shares)	10,000,000	10,000,000
Preferred stock, issued (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	325,000,000	325,000,000
Common stock, shares issued (in shares)	46,839,982	31,029,642
Common stock, shares outstanding (in shares)	46,486,919	30,676,579
Treasury stock, shares (in shares)	353,063	353,063