Note 3 - Digital Assets - Cost of Revenue Related to Crypto Assets (Details) - USD ($) |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Cost of Goods and Service, Excluding Depreciation, Depletion, and Amortization | $ 248,000 | $ 364,000 | $ 485,000 | $ 737,000 |
| Digital Assets [Member] | ||||
| Cost of Goods and Service, Excluding Depreciation, Depletion, and Amortization | 6,000 | 0 | 12,000 | 0 |
| Cash Transaction Fee [Member] | Digital Assets [Member] | ||||
| Cost of Goods and Service, Excluding Depreciation, Depletion, and Amortization | 2,000 | 0 | 4,000 | 0 |
| Advisory Fees Related to Staking [Member] | Digital Assets [Member] | ||||
| Cost of Goods and Service, Excluding Depreciation, Depletion, and Amortization | $ 4,000 | $ 0 | $ 8,000 | $ 0 |