Earnings (Loss) per Common Share (Narrative) (Details) - $ / shares	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Options included in computation of dilutive loss per common share (in shares)			200,000
Options exercised (in shares)	63,500	0	100,000
Warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities not included (in shares)	1,500,000	1,600,000	1,600,000
Restricted Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities not included (in shares)	300,000	100,000	100,000
Convertible Preferred Shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities not included (in shares)		700,000	700,000
Common Stock Equivalent Units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities not included (in shares)			300,000
Stock Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities not included (in shares)	3,700,000	3,800,000	2,500,000
Antidilutive securities, weighted average exercise price (in dollars per share)	$ 53.88	$ 54.66	$ 63.86