CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' (DEFICIT) EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Income
Beginning balance (in shares) at Jul. 31, 2020		62,787,919
Beginning balance at Jul. 31, 2020	$ 48,818	$ 628	$ 7,478,047	$ (7,433,700)	$ 3,843
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(5,747)			(5,747)
Preferred dividends	(1,067)			(1,067)
Issuance of common stock pursuant to employee stock purchase plan (in shares)		8,430
Issuance of common stock pursuant to employee stock purchase plan	4		4
Restricted stock grants (in shares)		236,860
Restricted stock grants	0	$ 2	(2)
Restricted stock forfeitures, net of issuance (in shares)		(32,895)
Restricted stock forfeitures	0	$ 0	0
Share-based compensation	346		346
Other comprehensive items	5,393				5,393
Ending balance (in shares) at Jan. 31, 2021		63,000,314
Ending balance at Jan. 31, 2021	47,747	$ 630	7,478,395	(7,440,514)	9,236
Beginning balance (in shares) at Oct. 31, 2020		62,793,969
Beginning balance at Oct. 31, 2020	47,894	$ 628	7,478,238	(7,437,788)	6,816
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(2,196)			(2,196)
Preferred dividends	(530)			(530)
Issuance of common stock pursuant to employee stock purchase plan (in shares)		1,448
Issuance of common stock pursuant to employee stock purchase plan	1		1
Restricted stock grants (in shares)		204,897
Restricted stock grants	0	$ 2	(2)
Share-based compensation	158		158
Other comprehensive items	2,420				2,420
Ending balance (in shares) at Jan. 31, 2021		63,000,314
Ending balance at Jan. 31, 2021	$ 47,747	$ 630	7,478,395	(7,440,514)	9,236
Beginning balance (in shares) at Jul. 31, 2021	63,099,496	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 loss	(42,471)			(42,471)
Preferred dividends	(1,074)			(1,074)
Issuance of common stock pursuant to employee stock purchase plan (in shares)		499
Restricted stock grants (in shares)		207,725
Restricted stock grants	0	$ 2	(2)
Restricted stock forfeitures, net of issuance (in shares)		(2,850,000)
Restricted stock forfeitures	0	$ (29)	29
Share-based compensation	408		408
Other comprehensive items	$ 185				185
Ending balance (in shares) at Jan. 31, 2022	60,457,720	60,457,720
Ending balance at Jan. 31, 2022	$ (36,740)	$ 605	7,479,073	(7,523,765)	7,347
Beginning balance (in shares) at Oct. 31, 2021		60,437,654
Beginning balance at Oct. 31, 2021	(13,431)	$ 605	7,478,855	(7,500,251)	7,360
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(22,977)			(22,977)
Preferred dividends	(537)			(537)
Issuance of common stock pursuant to employee stock purchase plan (in shares)		331
Restricted stock grants (in shares)		119,735
Restricted stock grants	0	$ 1	(1)
Restricted stock forfeitures, net of issuance (in shares)		(100,000)
Restricted stock forfeitures	0	$ (1)	1
Share-based compensation	218		218
Other comprehensive items	$ (13)				(13)
Ending balance (in shares) at Jan. 31, 2022	60,457,720	60,457,720
Ending balance at Jan. 31, 2022	$ (36,740)	$ 605	$ 7,479,073	$ (7,523,765)	$ 7,347