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Income taxes (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Income taxes [Abstract]
Expected tax expense, at the U.S. federal statutory income tax rate of 21%	$ 1,505	$ 1,339	$ 2,921	$ 2,376
U.S. federal statutory income tax rate	21.00%	21.00%	21.00%	21.00%
State income taxes	$ 201	$ 188	$ 391	$ 333
Other, net	7	5	12	8
Total provision for income taxes	1,713	1,532	3,324	2,717
Net income	1,713	1,532	3,324	2,717
Other comprehensive income - marketable securities		1
Total	$ 1,713	$ 1,533	$ 3,324	$ 2,717

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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