Note 3 - Digital Assets - Cost of Revenue Related to Crypto Assets (Details)	3 Months Ended
Mar. 31, 2026 USD ($)	Mar. 31, 2025 USD ($)
Cost of revenue	$ 237,000	$ 373,000
Digital Assets [Member]
Crypto Asset, Cost of Revenue, Units	0	0
Cost of revenue	$ 6,000	$ 0
Cash Transaction Fee [Member] \| Digital Assets [Member]
Crypto Asset, Cost of Revenue, Units	0	0
Cost of revenue	$ 2,000	$ 0
Advisory Fees Related to Staking [Member] \| Digital Assets [Member]
Crypto Asset, Cost of Revenue, Units	0	0
Cost of revenue	$ 4,000	$ 0

Cost of product sold and service rendered, excluding depreciation, depletion, and amortization.

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 220
-SubTopic 40
-Name Accounting Standards Codification
-Section 55
-Paragraph 18
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476153/220-40-55-18

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(2)(d))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Topic 220
-SubTopic 40
-Name Accounting Standards Codification
-Section 55
-Paragraph 14
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476153/220-40-55-14

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(2)(a))
-SubTopic 10
-Topic 220
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2

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