Note 19 - Income Taxes - Net Operating Loss Carry-forwards Expirations (Details) - Jul. 31, 2022 $ in Thousands, $ in Thousands	USD ($)	CAD ($)
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Net Operating Loss Carry-forwards Subject to Expiration	$ 199,030
Foreign Tax Authority [Member] | Canada Revenue Agency [Member]
Net Operating Loss Carry-forwards Subject to Expiration		$ 4,532
Tax Year 2023 [Member] | Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Net Operating Loss Carry-forwards Subject to Expiration	1,887
Tax Year 2027 [Member] | Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Net Operating Loss Carry-forwards Subject to Expiration	6,807
Tax Year 2027 [Member] | Foreign Tax Authority [Member] | Canada Revenue Agency [Member]
Net Operating Loss Carry-forwards Subject to Expiration		183
Tax Year 2024 [Member] | Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Net Operating Loss Carry-forwards Subject to Expiration	2,035
Tax Year 2028 [Member] | Foreign Tax Authority [Member] | Canada Revenue Agency [Member]
Net Operating Loss Carry-forwards Subject to Expiration		630
Tax Year 2025 [Member] | Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Net Operating Loss Carry-forwards Subject to Expiration	2,398
Tax Year 2029 [Member] | Foreign Tax Authority [Member] | Canada Revenue Agency [Member]
Net Operating Loss Carry-forwards Subject to Expiration		769
Tax Year 2026 [Member] | Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Net Operating Loss Carry-forwards Subject to Expiration	8,461
Tax Year 2030 [Member] | Foreign Tax Authority [Member] | Canada Revenue Agency [Member]
Net Operating Loss Carry-forwards Subject to Expiration		764
Tax Year 2031 [Member] | Foreign Tax Authority [Member] | Canada Revenue Agency [Member]
Net Operating Loss Carry-forwards Subject to Expiration		1,206
Remaining [Member] | Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Net Operating Loss Carry-forwards Subject to Expiration	$ 177,442
Remaining [Member] | Foreign Tax Authority [Member] | Canada Revenue Agency [Member]
Net Operating Loss Carry-forwards Subject to Expiration		$ 980