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Note 10 - Subsequent Event (Details Textual)		3 Months Ended		9 Months Ended
	Oct. 09, 2019	Sep. 30, 2019 $ / shares shares	Sep. 30, 2018 $ / shares	Sep. 30, 2019 $ / shares shares	Sep. 30, 2018 $ / shares	Nov. 08, 2019 shares	Dec. 31, 2018 shares
Common Stock, Shares, Outstanding, Ending Balance		3,211,565		3,211,565			3,244,332
Treasury Stock, Shares, Ending Balance		435,581		435,581			386,165
Earnings Per Share, Basic, Total | $ / shares		$ 1.01	$ 1.02	$ 2.95	$ 2.79
Earnings Per Share, Basic, If Two-for-one Stock Split Had Occurred | $ / shares				$ 1.48
Forecast [Member]
Common Stock, Shares, Outstanding, Ending Balance						6,400,000
Treasury Stock, Shares, Ending Balance						871,000
Subsequent Event [Member]
Stockholders' Equity Note, Stock Split, Conversion Ratio	2

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one.

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