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Note 9 - Stock Split Disclosure - Effect of Stock Split (Details) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Restated net income per common share - basic (in dollars per share)	$ 0.29	$ 0.51	$ 0.92	$ 1.48
Restated net income per common share - diluted (in dollars per share)	$ 0.29	$ 0.50	$ 0.92	$ 1.47
Restated weighted-average common shares issued (in shares)	7,305,653	7,294,014	7,301,091	7,283,808
Restated average treasury stock shares (in shares)	929,362	835,756	913,510	797,606
Restated average shares outstanding - basic (in shares)	6,376,291	6,458,258	6,387,581	6,486,202
Restated stock options and restricted stock (in shares)	9,474	20,808	10,093	20,636
Restated average shares outstanding - diluted (in shares)	6,385,765	6,479,066	6,397,674	6,506,838
Restated period ending shares outstanding (in shares)	6,378,110	6,423,130	6,378,110	6,423,130	6,423,630
Restated treasury shares outstanding (in shares)	929,362	871,162	929,362	871,162	871,162

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

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