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Note 16 - Subsequent Events (Details Textual) - USD ($) |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 25, 2022 | May 25, 2022 | Feb. 25, 2022 | Aug. 31, 2022 | Jul. 31, 2022 | May 31, 2022 | Apr. 30, 2022 | Feb. 28, 2022 | Jan. 31, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Nov. 30, 2023 | Nov. 03, 2022
Dividends declared, per share (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 0.025 | $ 0.025 | $ 0 | $ 0.05 | $ 0 |  |
Dividends, Total |  | $ 2,600,000 | $ 2,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 53,000 | $ 53,000
Quarterly Dividend [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared, per share (in dollars per share) |  |  |  |  |  |  | $ 0.025 |  | $ 0.025 |  |  |  |  |  |  |
Quarterly Dividend [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared, per share (in dollars per share) |  |  |  |  | $ 0.025 |  |  |  |  |  |  |  |  |  |  |
Dividends, Total | $ 2,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend Equivalent [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends, Total |  |  |  |  |  | $ 214,000 |  | $ 214,000 |  |  |  |  |  |  |  |
Dividends Payable |  |  |  |  |  | $ 36,000 |  | $ 36,000 |  |  |  |  |  |  |  |
Dividend Equivalent [Member] | Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends, Total |  |  |  | $ 263,000 |  |  |  |  |  |  |  |  |  |  |  |

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