Note 1 - Description of Business and Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2023

Notes Tables

Debt Securities, Held-to-Maturity [Table Text Block]

	Amortized Cost		Gross Unrealized Gain		Fair Value
Held to maturity U.S. Treasury securities	$	37,548	$	103	$	37,651

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

	Years Ended December 31,
	2023		2022
Numerator:
Net earnings	$	73,831	$	52,689
Less dividends declared:
Class A		512		514
Class B		2,997		2,922
Undistributed earnings	$	70,322	$	49,253
Undistributed earnings allocation:
Class A undistributed earnings	$	11,318	$	8,084
Class B undistributed earnings		59,004		41,169
Total undistributed earnings	$	70,322	$	49,253
Net earnings allocation:
Class A net earnings	$	11,830	$	8,598
Class B net earnings		62,001		44,091
Net earnings	$	73,831	$	52,689
Denominator:
Weighted average shares outstanding:
Class A		2,142		2,143
Class B		10,634		10,394
Net earnings per share:
Class A	$	5.52	$	4.01
Class B	$	5.83	$	4.24