Note 5 - Stockholders' Equity (Deficit) (Tables)

9 Months Ended

Sep. 30, 2021

Notes Tables

Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]

	Number of shares			Weighted average grant date fair value per share
Unvested as of December 31, 2020		515,352		$	6.12
Granted		1,037,334			11.70
Vested		(657,352	)		9.70
Forfeited		(91,974	)		7.53
Unvested as of September 30, 2021		803,360		$	10.24