Note 2 - Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2021

Notes Tables

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

	Three Months Ended March 31,
	2021		2020
Warrants to purchase common stock - liability classified		56,735		54,669
Warrant to purchase common stock - equity classified		94,108		—
Conversion of 2020/21 Notes		—		6,713,817
Outstanding options to purchase common stock		1,517		1,561
Stock appreciation rights		67,739		67,739
Total		220,099		6,837,786