Quarterly report [Sections 13 or 15(d)]

Note 2 - Summary of Significant Accounting Policies - Reconciliation of Net Loss (Details)

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Note 2 - Summary of Significant Accounting Policies - Reconciliation of Net Loss (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Net loss $ (2,783,000) $ (2,455,000) $ (7,013,000) $ (7,715,000)
Preferred Dividends paid in shares of common stock (100,000) (1,592,000) (101,000) (1,596,000)
Net loss attributable to common stockholders $ (2,883,000) $ (4,047,000) $ (7,114,000) $ (9,311,000)