Employee Benefits (Details - Asset allocation)	Dec. 31, 2023	Dec. 31, 2022
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items]
Weighted Average Asset Allocation at Year-End	100.00%	100.00%
Equity Securities [Member]
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items]
Weighted Average Asset Allocation at Year-End	87.00%	87.00%
Debt Securities [Member]
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items]
Weighted Average Asset Allocation at Year-End	13.00%	13.00%
Cash and Cash Equivalents [Member]
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items]
Weighted Average Asset Allocation at Year-End	0.00%	0.00%