CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' DEFICIT - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Income
Beginning balance (in shares) at Jul. 31, 2021		63,099,496
Beginning balance at Jul. 31, 2021	$ 6,212	$ 632	$ 7,478,638	$ (7,480,220)	$ 7,162
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(12,271)			(12,271)
Preferred dividends	(1,611)			(1,611)
Issuance of common stock pursuant to employee stock purchase plan (in shares)		499
Restricted stock grants (in shares)		348,789
Restricted stock grants	0	$ 3	(3)
Restricted stock forfeitures (in shares)		(3,050,000)
Restricted stock forfeitures	0	$ (31)	31
Share-based compensation	519		519
Other comprehensive items	(2,276)				(2,276)
Ending balance (in shares) at Apr. 30, 2022		60,398,784
Ending balance at Apr. 30, 2022	(9,427)	$ 604	7,479,185	(7,494,102)	4,886
Beginning balance (in shares) at Jan. 31, 2022		60,457,720
Beginning balance at Jan. 31, 2022	(36,740)	$ 605	7,479,073	(7,523,765)	7,347
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	30,200			30,200
Preferred dividends	(537)			(537)
Restricted stock grants (in shares)		141,064
Restricted stock grants	0	$ 1	(1)
Restricted stock forfeitures (in shares)		(200,000)
Restricted stock forfeitures	0	$ (2)	2
Share-based compensation	111		111
Other comprehensive items	(2,461)				(2,461)
Ending balance (in shares) at Apr. 30, 2022		60,398,784
Ending balance at Apr. 30, 2022	$ (9,427)	$ 604	7,479,185	(7,494,102)	4,886
Beginning balance (in shares) at Jul. 31, 2022	60,529,558	60,529,558
Beginning balance at Jul. 31, 2022	$ (9,206)	$ 605	7,479,366	(7,493,317)	4,140
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	7,460			7,460
Preferred dividends	(1,593)			(1,593)
Restricted stock grants (in shares)		412,902
Restricted stock grants	0	$ 4	(4)
Share-based compensation	529		529
Other comprehensive items	$ (79)				(79)
Ending balance (in shares) at Apr. 30, 2023	60,942,460	60,942,460
Ending balance at Apr. 30, 2023	$ (2,889)	$ 609	7,479,891	(7,487,450)	4,061
Beginning balance (in shares) at Jan. 31, 2023		60,784,589
Beginning balance at Jan. 31, 2023	(4,754)	$ 607	7,479,719	(7,489,960)	4,880
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	3,029			3,029
Preferred dividends	(519)			(519)
Restricted stock grants (in shares)		157,871
Restricted stock grants	0	$ 2	(2)
Share-based compensation	174		174
Other comprehensive items	$ (819)				(819)
Ending balance (in shares) at Apr. 30, 2023	60,942,460	60,942,460
Ending balance at Apr. 30, 2023	$ (2,889)	$ 609	$ 7,479,891	$ (7,487,450)	$ 4,061