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5) Value of Business Acquired and Goodwill: Net amortization charged to income (Details) - USD ($)
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Details              
Value of business acquired - net amortization charged to income $ 593,000 $ 637,000 $ 685,000 $ 737,000 $ 821,000 $ 823,569 $ 981,541