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Pension and Other Postretirement Benefit Plans - Employee Benefit Trust Shares (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Note 12 - Pension and Other Postretirement Benefit Plans - Employee Benefit Trust (EBT) Shares (Details)
Shares owned by Employee Benefit Trust, beginning balance (in shares)	329,090	445,022
Shares purchased (in shares)	7,267	13,669
Shares released and allocated (in shares)	(154,746)	(129,601)
Shares owned by Employee Benefit Trust, ending balance (in shares)	181,611	329,090
Market value of unallocated shares	$ 3,924,614	$ 7,085,308

X

- Definition

Number of shares purchased during the period by the Employee Trust.

+ References

No definition available.

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- Definition

Common stock released and allocated by the Employee Trust.

+ References

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- References

No definition available.

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- Definition

Aggregate value of common stock held in a trust that has been set up specifically to accumulate stock for the sole purpose of distribution to participating employees but not yet earned.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 710
-SubTopic 10
-Section 25
-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=75028277&loc=d3e19833-108362

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 710
-SubTopic 10
-Section 25
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=75028277&loc=d3e19850-108362

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- Definition

Number of common stock held in a trust that has been set up specifically to accumulate stock for the sole purpose of distribution to participating employees but not yet earned.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 40
-Section 25
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=109244457&loc=d3e16701-113920

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