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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