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Note 4 - Earnings Per Share (Details Textual) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance	7,250	13,600	7,250	13,600	7,450
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance	$ 17.55		$ 17.55		$ 17.55
Share-based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit		$ 17.55		$ 17.55
Share-based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit		$ 23		$ 23
Treasury Stock, Shares, Ending Balance	435,581		435,581		386,165
Treasury Stock, Shares, Acquired	31,669		49,416
Employee Stock Option and Restricted Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount			0	0
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance	30,770	20,425	30,770	20,425	21,175

X

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Number of options outstanding, including both vested and non-vested options.

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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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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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