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Note 3 - Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) | Mar. 31, 2026 | Dec. 31, 2025 | Mar. 31, 2025
--- | --- | --- | ---
SKY digital assets | $ 160,086 | $ 0 |
Warrant liability |  |  | $ 0
SKY Tokens [Member] |  |  |
SKY digital assets | 160,086,000 |  |
Fair Value, Recurring [Member] |  |  |
Restricted cash held as a certificate of deposit | 435,000 | 267,000 |
Warrant liability | 33,715,000 | 639,071,000 |
Fair Value, Recurring [Member] | SKY Tokens [Member] |  |  |
SKY digital assets | 160,086,000 |  |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Restricted cash held as a certificate of deposit | 435,000 | 267,000 |
Warrant liability | 0 | 0 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | SKY Tokens [Member] |  |  |
SKY digital assets | 160,086,000 |  |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Restricted cash held as a certificate of deposit | 0 | 0 |
Warrant liability | 33,715,000 | 639,071,000 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | SKY Tokens [Member] |  |  |
SKY digital assets | 0 |  |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Restricted cash held as a certificate of deposit | 0 | 0 |
Warrant liability | 0 | $ 0 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | SKY Tokens [Member] |  |  |
SKY digital assets | $ 0 |  |

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- Definition Fair value of crypto asset. Excludes crypto asset held for platform user. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 60 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147476162/350-60-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 60 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147476162/350-60-50-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 60 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147476162/350-60-50-3 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 60 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147476163/350-60-45-1 + Details
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