Note 2 - Earnings Per Share - Securities that Potentially Dilute Calculation of Diluted Earnings Per Share (Details) - shares	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Potentially dilute securities (in shares)	6,965,892	2,749,675
Share-based Payment Arrangement, Option [Member]
Potentially dilute securities (in shares)	1,556	2,361
Stock Appreciation Rights (SARs) [Member]
Potentially dilute securities (in shares)	132,566	132,566
Restricted Stock [Member]
Potentially dilute securities (in shares)		1,538,184
Convertible 2020/21 Notes [Member]
Potentially dilute securities (in shares)	6,780,958
Convertible 2020 Notes [Member]
Potentially dilute securities (in shares)		1,020,595
Warrant [Member]
Potentially dilute securities (in shares)	50,812	55,963
Warrants Classified as Equity [Member]
Potentially dilute securities (in shares)		6