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Note 7 - Redeemable, Convertible Preferred Stock - Schedule of Redeemable, Convertible Preferred Stock (Parenthetical) (Details)
3 Months Ended 12 Months Ended
Mar. 11, 2026
Feb. 26, 2021
Feb. 25, 2021
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
6.0% Series B Preferred Stock [Member]            
Redeemable Convertible Preferred Stocks [Line Items]            
Preferred Stock, Dividend Rate, Percentage 6.00%     6.00% 6.00% 6.00%
4.0% Series B Preferred Stock [Member]            
Redeemable Convertible Preferred Stocks [Line Items]            
Preferred Stock, Dividend Rate, Percentage 4.00% 4.00% 4.00% 4.00% 4.00% 4.00%