(11) Employee Benefits (Details - Asset allocation)	Dec. 31, 2021	Dec. 31, 2020
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Weighted Average Asset Allocation at Year-End	100.00%	100.00%
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%
Equity Securities [Member]
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Weighted Average Asset Allocation at Year-End	78.00%	82.00%
Debt Securities [Member]
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Weighted Average Asset Allocation at Year-End	22.00%	18.00%