Note 2 - Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2020

Notes Tables

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

	March 31,
	2020	2019
Warrants to purchase common stock - liability classified	54,669	55,963
Warrant to purchase common stock - equity classified	—	6
Conversion of 2020/21 Notes	6,713,817	—
Conversion of 2020 Notes	—	1,044,134
Outstanding options to purchase common stock	1,561	2,311
Stock appreciation rights	132,566	132,559
Unvested restricted common stock	—	284,300
Total	6,902,613	1,519,273