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Income taxes (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Income taxes [Abstract]
Expected tax expense, at the U.S. federal statutory income tax rate of 21%	$ 1,416	$ 1,037
U.S. federal statutory income tax rate	21.00%	21.00%
State income taxes	$ 190	$ 145
Other, net	5	3
Total provision for income taxes	1,611	1,185
Net income	1,611	1,185
Other comprehensive loss - marketable securities		(1)
Total	$ 1,611	$ 1,184

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

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