Note 8 - Stock-based Compensation and Expense (Tables)

3 Months Ended

Mar. 31, 2022

Notes Tables

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

	Number of restricted shares			Weighted-average grant date fair value
Non-vested shares, beginning of year		3,018,788		$	4.58
Granted		2,810,414			1.94
Vested		(1,332,788	)		1.96
Forfeited		(2,000,000	)		5.46
Non-vested shares, end of period		2,496,414		$	2.30