CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Income
Beginning balance (in shares) at Jul. 31, 2019		61,805,856
Beginning balance at Jul. 31, 2019	$ 52,692	$ 618	$ 7,477,327	$ (7,426,287)	$ 1,034
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	1,235			1,235
Preferred dividends	(1,067)			(1,067)
Issuance of common stock pursuant to employee stock purchase plan (in shares)		9,179
Issuance of common stock pursuant to employee stock purchase plan	4		4
Restricted stock grants (in shares)		560,523
Restricted stock grants	0	$ 6	(6)
Share-based compensation	372		372
Other comprehensive items	579				579
Ending balance (in shares) at Jan. 31, 2020		62,375,558
Ending balance at Jan. 31, 2020	53,815	$ 624	7,477,697	(7,426,119)	1,613
Beginning balance (in shares) at Oct. 31, 2019		61,810,253
Beginning balance at Oct. 31, 2019	57,137	$ 618	7,477,505	(7,422,031)	1,045
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	(3,557)			(3,557)
Preferred dividends	(531)			(531)
Issuance of common stock pursuant to employee stock purchase plan (in shares)		4,782
Issuance of common stock pursuant to employee stock purchase plan	2		2
Restricted stock grants (in shares)		560,523
Restricted stock grants	0	$ 6	(6)
Share-based compensation	196		196
Other comprehensive items	568				568
Ending balance (in shares) at Jan. 31, 2020		62,375,558
Ending balance at Jan. 31, 2020	$ 53,815	$ 624	7,477,697	(7,426,119)	1,613
Beginning balance (in shares) at Jul. 31, 2020	62,787,919	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) income	(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 (in shares)		(32,895)
Share-based compensation	346		346
Other comprehensive items	$ 5,393				5,393
Ending balance (in shares) at Jan. 31, 2021	63,000,314	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) income	(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	63,000,314
Ending balance at Jan. 31, 2021	$ 47,747	$ 630	$ 7,478,395	$ (7,440,514)	$ 9,236