Pension and Other Postretirement Benefit Plans - Employee Benefit Trust Shares (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Note 13 - Pension and Other Postretirement Benefit Plans - Employee Benefit Trust (EBT) Shares (Details)
Shares owned by Employee Benefit Trust, beginning balance (in shares)	17,964	39,861
Shares purchased (in shares)		1,039
Shares released and allocated (in shares)	(17,964)	(22,936)
Shares owned by Employee Benefit Trust, ending balance (in shares)	0	17,964
Market value of unallocated shares		$ 436,525