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Note 13 - Employee and Postretirement Benefit Plans - Stock Option Activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Outstanding, beginning of year (in shares)	115,714	165,660
Outstanding, beginning of year (in dollars per share)	$ 18.49	$ 18.49
Granted (in shares)	0	0
Granted (in dollars per share)
Shares issued from treasury and redeemed related to exercise of stock options (in shares)	(31,304)	(41,210)
Exercised (in dollars per share)	$ 17.65	$ 18.69
Forfeited (in shares)	0	0
Forfeited (in dollars per share)
Expired (in shares)	(8,513)	(8,736)
Expired (in dollars per share)	$ 19.88	$ 17.50
Outstanding, end of year (in shares)	75,897	115,714
Outstanding, end of year (in dollars per share)	$ 18.69	$ 18.49
Options exercisable at year-end (in shares)	75,897	115,714
Options exercisable at year-end (in dollars per share)	$ 18.69	$ 18.49
Weighted-average fair value of options forfeited (in dollars per share)

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Weighted average fair value of options granted.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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