Note 9 - Income Taxes (Details Textual) |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| US Federal Gross Transportation Income Tax Rate | 4.00% | 4.00% | 4.00% |
| US Source Gross Transportation Income as Percentage of Gross Transportation Shipping Income | 50.00% | ||
| Override Rule to Which the Entity is Subject, Percentage | 5.00% | 5.00% | 5.00% |