Note 7 - Share-based Compensation (Tables)

6 Months Ended

Jun. 30, 2024

Notes Tables

Schedule of Employee Service Share Based Compensation Allocation of Recognized Period Costs, By Award Type [Table Text Block]

	Three Months Ended				Six Months Ended
	June 30,				June 30,
Share-based compensation related to:	2024		2023		2024		2023
Common stock grants	$	100	$	100	$	200	$	200
Stock option grants		118		113		230		207
Restricted Stock Unit Awards ("RSUs")		1,518		984		2,819		1,846
Total share-based compensation	$	1,736	$	1,197	$	3,249	$	2,253

Share-Based Payment Arrangement, Option, Activity [Table Text Block]

	Shares Under Options			Weighted Average Exercise Price (per share)		Weighted Average Remaining Contractual Life (in years)		Aggregate Intrinsic Value (in thousands)
Outstanding at December 31, 2023		78,488		$	39.98
Granted		2,958			260.92
Exercised		(6,568	)		32.35
Outstanding at June 30, 2024		74,878		$	67.37		5.42	$	14,714
Exercisable at June 30, 2024		67,952		$	56.36		5.33	$	14,100
Vested and expected to vest at June 30, 2024		74,878		$	67.37		5.42	$	14,714

Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

Expected volatility		39.7	%
Expected dividends	None
Risk-free interest rate		4.3	%
Exercise price	$	260.92
Expected term		6.3
Weighted-average grant date fair value	$	121.61

Share-Based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]

	Restricted Stock Units			Weighted Average Grant Date Fair Value
Outstanding at December 31, 2023		95,693		$	64.82
Awarded		31,663			175.30
Shares vested		(50,582	)		79.53
Shares forfeited		(378	)		139.55
Outstanding at June 30, 2024		76,396		$	85.47