Note 3 - Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025	Jun. 30, 2025
SKY digital assets	$ 119,242	$ 0
Warrant liability	0		$ 0
SKY Tokens [Member]
SKY digital assets	119,242
Fair Value, Recurring [Member]
Restricted cash held as a certificate of deposit	154	267
Warrant liability		639,071
Fair Value, Recurring [Member] \| SKY Tokens [Member]
SKY digital assets	119,242
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Restricted cash held as a certificate of deposit	154	267
Warrant liability		0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| SKY Tokens [Member]
SKY digital assets	119,242
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Restricted cash held as a certificate of deposit	0	0
Warrant liability		639,071
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
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| SKY Tokens [Member]
SKY digital assets	$ 0