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Note 11 - Subsequent Events (Details Textual) - USD ($) $ / shares in Units, $ in Thousands |  |  | 1 Months Ended | 3 Months Ended |
--- | --- | --- | --- | --- | ---
May 08, 2024 | Apr. 23, 2024 | Apr. 18, 2024 | Mar. 31, 2024 | Mar. 31, 2023 | Apr. 04, 2024
Dividends, Common Stock |  |  |  | $ 7,243 | $ 6,732 |
Common Stock, Dividends, Per Share, Declared (in dollars per share) |  |  |  | $ 0.12 |  |
Subsequent Event [Member] |  |  |  |  |  |
Dividends, Common Stock | $ 7,200 |  |  |  |  |
Common Stock, Dividends, Per Share, Declared (in dollars per share) | $ 0.12 |  |  |  |  |
Dividends Payable, Date to be Paid | Jun. 05, 2024 |  |  |  |  |
Subsequent Event [Member] | Kenya Revenue Authority [Member] | Foreign Tax Jurisdiction [Member] |  |  |  |  |  |
Income Tax Examination, Estimate of Possible Loss |  | $ 79,000 |  |  |  |
Subsequent Event [Member] | Kenya Revenue Authority [Member] | Foreign Tax Jurisdiction [Member] | Minimum [Member] |  |  |  |  |  |
Income Tax Examination, Year under Examination |  | 2017 |  |  |  |
Subsequent Event [Member] | Kenya Revenue Authority [Member] | Foreign Tax Jurisdiction [Member] | Maximum [Member] |  |  |  |  |  |
Income Tax Examination, Year under Examination |  | 2022 |  |  |  |
Subsequent Event [Member] | DEG [Member] |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  | $ 30,000
Proceeds from Issuance of Debt |  |  | $ 30,000 |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 7.79% |  |  |
Debt Instrument, Number of Semi-annual Payments |  |  | 6 |  |  |

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