Note 7 - Earnings per Share - Basic and Diluted (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2025	Mar. 31, 2025	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2025	Jun. 30, 2024
Earnings per Share
Net income	$ 29,019	$ 25,797	$ 29,114	$ 26,726	$ 54,816	$ 55,840
Basic EPS	$ 1.71		$ 1.73		$ 3.24	$ 3.32
Diluted EPS	$ 1.71		$ 1.72		$ 3.22	$ 3.3
Weighted average common shares outstanding	16,928,542		16,814,814		16,914,663	16,799,081
Weighted average common shares issuable upon exercise of stock options and under the employee stock purchase plan (in shares)	77,740		107,040		95,473	117,183
Weighted average common and common equivalent shares outstanding	17,006,282		16,921,854		17,010,136	16,916,264

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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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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+ Details