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Note 6 - Share-based Payments - Summary of Status of Employees' Restricted Stock Unit Awards (Details) - Restricted Stock Units (RSUs) [Member] - Employees [Member] - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Nonvested, Beginning of Year (in shares)	49,470	46,440	47,370
Nonvested, Beginning of Year, weighted average grant-date fair value (in dollars per share)	$ 31.03	$ 27.07	$ 25.19
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	13,270	14,780	10,995
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 44.45	$ 38.99	$ 33.28
Vested (in shares)	13,250	8,925	11,550
Vested, weighted average grant-date fair value (in dollars per share)	$ 27.62	$ 25.23	$ 25.30
Forfeited (in shares)	1,900	2,825	375
Forfeited, weighted-average grant-date fair value (in dollars per share)	$ 34.57	$ 25.86	$ 26.92
Nonvested, End of Year (in shares)	47,590	49,470	46,440
Nonvested, End of Year, weighted average grant-date fair value (in dollars per share)	$ 35.58	$ 31.03	$ 27.07
Compensation Expense Recognized	$ 427,000	$ 351,000	$ 331,000
Fair Value of Shares Vested in Year	$ 366,000	$ 225,000	$ 292,000

X

- Definition

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

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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