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Note 17 - Revisions of Previously Issued Unaudited Consolidated Financial Statements (Unaudited) - Balance Sheets (Details) - USD ($) | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Equity investment in unconsolidated affiliate | $ 4,718,000 | $ 4,783,000 | $ 4,932,000 | $ 5,147,000,000 | $ 5,251,000 |  | $ 5,183,000 | $ 5,257,000 | $ 4,990,000,000 |
Total assets | 64,803,000 | 65,081,000 | 66,694,000 | 66,747,000,000 | 67,020,000 |  | 67,025,000 | 66,804,000 | 67,573,000,000 |
Retained earnings | 62,124,000 | 62,559,000 | 63,108,000 | 63,311,000,000 | 62,488,000 |  | 62,596,000 | 62,130,000 | 61,648,000,000 |
Accumulated other comprehensive loss | (1,489,000) | (1,424,000) | (1,287,000) | (1,022,000,000) | (869,000) |  | (989,000) | (802,000) | (881,000,000) |
Total shareholders' equity | 60,758,000 | 61,261,000 | 61,949,000 | 62,419,000,000 | 61,751,000 |  | 61,739,000 | 61,460,000 | 60,901,000,000 | $ 58,757,000
Total liabilities and shareholders' equity | $ 64,803,000 | 65,081,000 | 66,694,000 | 66,747,000,000 | 67,020,000 |  | 67,025,000 | 66,804,000 | 67,573,000,000 |
Previously Reported [Member] |  |  |  |  |  |  |  |  |  |
Equity investment in unconsolidated affiliate |  | 6,207,000 | 6,219,000 | 6,169,000,000 | 6,120,000 |  | 6,172,000 | 6,059,000 | 5,871,000,000 |
Total assets |  | 66,505,000 | 67,981,000 | 67,769,000,000 | 67,889,000 |  | 68,014,000 | 67,606,000 | 68,454,000,000 |
Retained earnings |  | 62,559,000 | 63,108,000 | 63,311,000,000 | 62,488,000 |  | 62,596,000 | 62,130,000 | 61,648,000,000 |
Accumulated other comprehensive loss |  | 0 | 0 | 0 | 0 |  | 0 | 0 | 0 |
Total shareholders' equity |  | 62,685,000 | 63,236,000 | 63,441,000,000 | 62,620,000 |  | 62,728,000 | 62,262,000 | 61,782,000,000 |
Total liabilities and shareholders' equity |  | 66,505,000 | 67,981,000 | 67,769,000,000 | 67,889,000 |  | 68,014,000 | 67,606,000 | 68,454,000,000 |
Revision of Prior Period, Adjustment [Member] |  |  |  |  |  |  |  |  |  |
Equity investment in unconsolidated affiliate |  | (1,424,000) | (1,287,000) | (1,022,000,000) | (869,000) | [1] | (989,000) | (802,000) | (881,000,000) |
Total assets |  | (1,424,000) | (1,287,000) | (1,022,000,000) | (869,000) | [1] | (989,000) | (802,000) | (881,000,000) |
Retained earnings |  | 0 | 0 | 0 | 0 | [1] | 0 | 0 | 0 |
Accumulated other comprehensive loss |  | (1,424,000) | (1,287,000) | (1,022,000,000) | (869,000) | [1] | (989,000) | (802,000) | (881,000,000) |
Total shareholders' equity |  | (1,424,000) | (1,287,000) | (1,022,000,000) | (869,000) | [1] | (989,000) | (802,000) | (881,000,000) |
Total liabilities and shareholders' equity |  | $ (1,424,000) | $ (1,287,000) | $ (1,022,000,000) | $ (869,000) | [1] | $ (989,000) | $ (802,000) | $ (881,000,000) |
[1] | Equity investment in unconsolidated affiliate and accumulated other comprehensive loss have been adjusted by a total of $869,000, of which $773,000 pertains to periods prior to 2021 and $96,000 pertains to 2021.

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