Note 17 - Equity Offerings (Tables)

12 Months Ended

Dec. 31, 2021

Notes Tables

Schedule of Sales Under Sales Agency Agreement [Table Text Block]

	December 31,
	2021		2020		2019
Total shares of common stock sold		20,237,045		23,008,639		1,374,685
Average price per share	$	1.53	$	0.90	$	5.23
Gross proceeds	$	30,943	$	20,822	$	7,193
Commissions	$	928	$	625	$	212
Net proceeds	$	30,015	$	20,197	$	6,981