Note 2 - Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2021

Notes Tables

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]

	Three and Nine Months Ended September 30,
	2021		2020
Warrants to purchase common stock - liability classified		7,126		52,032
Warrant to purchase common stock - equity classified		90,608		2,682,166
Conversion of 2020/21 Notes		—		5,789,209
Outstanding options to purchase common stock		4,670,279		1,552
Stock appreciation rights		67,739		67,739
Total		4,835,752		8,592,698