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Note 6 - Share-based Payments - Summary of Status of Directors' Restricted Stock Awards (Details) - Director [Member] - Restricted Stock [Member] - USD ($)		12 Months Ended
	Apr. 08, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Nonvested, Beginning of Year (in shares)		43,225	46,800	46,334
Nonvested, Beginning of Year, weighted average grant-date fair value (in dollars per share)		$ 37.53	$ 32.65	$ 29.71
Shares/Units Granted (in shares)	15,700	15,700	18,200	17,600
Granted, weighted average grant-date fair value (in dollars per share)	$ 49.73	$ 49.73	$ 43.40	$ 37.75
Vested (in shares)		18,320	21,775	17,134
Vested, weighted average grant-date fair value (in dollars per share)		$ 36.02	$ 31.94	$ 29.93
Forfeited (in shares)		0	0	0
Nonvested, End of Year (in shares)		40,605	43,225	46,800
Nonvested, End of Year, weighted average grant-date fair value (in dollars per share)		$ 42.93	$ 37.53	$ 32.65
Compensation Expense Recognized		$ 776,000	$ 661,000	$ 658,000
Fair Value of Shares Vested in Year		$ 660,000	$ 696,000	$ 513,000

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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