Note 23 - Segment Information - Schedule of Revenue, Total Assets, and Long-term Assets by Geographic Segments (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2024	Jul. 31, 2023	Jul. 31, 2022	Jul. 31, 2021
Revenue	$ 224	$ 164,389	$ 23,161
Depreciation, amortization, and accretion	2,183	2,007	1,379
Income (loss) from equity-accounted investment	1,017	(994)	4,126
Income (loss) from operations before income taxes	(34,255)	(2,437)	5,247
Total assets	889,828	737,589	354,247
Equity-accounted investment	58,809	48,110	24,177	$ 20,730
Long-lived assets other than financial instruments	581,991	588,367	205,794
Total expenditures for additions to long-lived assets	3,457	387,216	1,685
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]
Revenue	0	163,950	22,946
Depreciation, amortization, and accretion	11	12	15
Income (loss) from equity-accounted investment	1,017	(994)	4,126
Income (loss) from operations before income taxes	7,561	23,595	20,123
Total assets	297,155	137,369	137,867
Equity-accounted investment	58,809	48,110	24,177
Long-lived assets other than financial instruments	200	193	209
Total expenditures for additions to long-lived assets	3	15	8
Mining, Wyoming [Member] | Operating Segments [Member]
Revenue	224	439	215
Depreciation, amortization, and accretion	1,584	1,526	983
Income (loss) from equity-accounted investment	0	0	0
Income (loss) from operations before income taxes	(14,741)	(9,142)	(5,320)
Total assets	169,740	169,706	170,115
Equity-accounted investment	0	0	0
Long-lived assets other than financial instruments	162,816	162,448	163,149
Total expenditures for additions to long-lived assets	646	62	13
Mining, Texas [Member] | Operating Segments [Member]
Revenue	0	0	0
Depreciation, amortization, and accretion	500	460	375
Income (loss) from equity-accounted investment	0	0	0
Income (loss) from operations before income taxes	(12,912)	(8,429)	(7,962)
Total assets	23,776	23,500	24,608
Equity-accounted investment	0	0	0
Long-lived assets other than financial instruments	21,028	20,710	21,259
Total expenditures for additions to long-lived assets	408	355	591
Mining, Saskatchewan [Member] | Operating Segments [Member]
Revenue	0	0	0
Depreciation, amortization, and accretion	84	3	0
Income (loss) from equity-accounted investment	0	0	0
Income (loss) from operations before income taxes	(13,247)	(6,842)	(5)
Total assets	378,368	386,356	982
Equity-accounted investment	0	0	0
Long-lived assets other than financial instruments	377,550	384,728	982
Total expenditures for additions to long-lived assets	2,281	386,684	435
Mining, Others [Member] | Operating Segments [Member]
Revenue	0	0	0
Depreciation, amortization, and accretion	4	6	6
Income (loss) from equity-accounted investment	0	0	0
Income (loss) from operations before income taxes	(916)	(1,619)	(1,589)
Total assets	20,789	20,658	20,675
Equity-accounted investment	0	0	0
Long-lived assets other than financial instruments	20,397	20,288	20,195
Total expenditures for additions to long-lived assets	$ 119	$ 100	$ 638