Note 2 - Earnings Per Share - Securities that Potentially Dilute Calculation of Diluted Earnings Per Share (Details) - shares	3 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Potentially dilute securities (in shares)	8,657,525	1,187,033
Share-based Payment Arrangement, Option [Member]
Potentially dilute securities (in shares)	1,552	1,564
Stock Appreciation Rights (SARs) [Member]
Potentially dilute securities (in shares)	132,566	132,566
Convertible 2020/21 Notes [Member]
Potentially dilute securities (in shares)	5,789,209
Convertible 2020 Notes [Member]
Potentially dilute securities (in shares)		997,914
Warrant [Member]
Potentially dilute securities (in shares)	52,032	54,989
Warrants Classified as Equity [Member]
Potentially dilute securities (in shares)	2,682,166