Note 22 - Income Taxes - Net Operating Loss Carry-forwards Expirations (Details) $ in Thousands	Jul. 31, 2024 USD ($)
Domestic Tax Jurisdiction [Member] | Internal Revenue Service (IRS) [Member]
No expiry	$ 116,754
Operating Loss Carryforwards	295,384
Foreign Tax Jurisdiction [Member] | Canada Revenue Agency [Member]
Net Operating Loss Carry-forwards Subject to Expiration	10,758
Tax Year 2025 [Member] | Domestic Tax Jurisdiction [Member] | Internal Revenue Service (IRS) [Member]
Net Operating Loss Carry-forwards Subject to Expiration	2,398
Tax Year 2027 [Member] | Domestic Tax Jurisdiction [Member] | Internal Revenue Service (IRS) [Member]
Net Operating Loss Carry-forwards Subject to Expiration	3,171
Tax Year 2027 [Member] | Foreign Tax Jurisdiction [Member] | Canada Revenue Agency [Member]
Net Operating Loss Carry-forwards Subject to Expiration	133
Tax Year 2026 [Member] | Domestic Tax Jurisdiction [Member] | Internal Revenue Service (IRS) [Member]
Net Operating Loss Carry-forwards Subject to Expiration	4,703
Tax Year 2028 [Member] | Domestic Tax Jurisdiction [Member] | Internal Revenue Service (IRS) [Member]
Net Operating Loss Carry-forwards Subject to Expiration	2,798
Tax Year 2028 [Member] | Foreign Tax Jurisdiction [Member] | Canada Revenue Agency [Member]
Net Operating Loss Carry-forwards Subject to Expiration	456
Tax Year 2029 [Member] | Domestic Tax Jurisdiction [Member] | Internal Revenue Service (IRS) [Member]
Net Operating Loss Carry-forwards Subject to Expiration	10,332
Tax Year 2029 [Member] | Foreign Tax Jurisdiction [Member] | Canada Revenue Agency [Member]
Net Operating Loss Carry-forwards Subject to Expiration	557
Tax Year 2030 [Member] | Foreign Tax Jurisdiction [Member] | Canada Revenue Agency [Member]
Net Operating Loss Carry-forwards Subject to Expiration	553
Tax Year 2031 [Member] | Foreign Tax Jurisdiction [Member] | Canada Revenue Agency [Member]
Net Operating Loss Carry-forwards Subject to Expiration	759
Tax Years 2030 to 2037 [Member] | Domestic Tax Jurisdiction [Member] | Internal Revenue Service (IRS) [Member]
Net Operating Loss Carry-forwards Subject to Expiration	155,228
Remaining [Member] | Foreign Tax Jurisdiction [Member] | Canada Revenue Agency [Member]
Net Operating Loss Carry-forwards Subject to Expiration	$ 8,300