Pension and Other Postretirement Benefit Plans - Employee Benefit Trust Shares (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Note 13 - Pension and Other Postretirement Benefit Plans - Employee Benefit Trust (EBT) Shares (Details)
Shares owned by Employee Benefit Trust, beginning balance (in shares)	39,861	181,611
Shares purchased (in shares)	1,039	3,697
Shares released and allocated (in shares)	(22,936)	(145,447)
Shares owned by Employee Benefit Trust, ending balance (in shares)	17,964	39,861
Market value of unallocated shares	$ 436,525	$ 663,287