Note 7 - Fair Value Measurements - Schedule of Instruments at Fair Value (Details) - USD ($)	Mar. 31, 2026	Dec. 31, 2025
Call Option [Member]
Ending written-call derivative liability	$ 21,000
Fair Value, Recurring [Member] \| Embedded Conversion Features [Member]
Ending written-call derivative liability	3,708,000
Fair Value, Recurring [Member] \| Call Option [Member]
Ending written-call derivative liability	21,000
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Embedded Conversion Features [Member]
Ending written-call derivative liability	0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Call Option [Member]
Ending written-call derivative liability	0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Embedded Conversion Features [Member]
Ending written-call derivative liability	0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Call Option [Member]
Ending written-call derivative liability	0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Embedded Conversion Features [Member]
Ending written-call derivative liability	3,708,000
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Call Option [Member]
Ending written-call derivative liability	21,000
Bitcoin [Member]
Bitcoin digital assets	4,709	$ 0
Bitcoin [Member] \| Fair Value, Recurring [Member]
Bitcoin digital assets	4,709,000
Bitcoin [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Bitcoin digital assets	4,709,000
Bitcoin [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Bitcoin digital assets	0
Bitcoin [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Bitcoin digital assets	$ 0

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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+ Details