Note 6 - Share-based Compensation (Tables)

3 Months Ended

Mar. 31, 2024

Notes Tables

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

	Three Months Ended
	March 31,
Share-based compensation related to:	2024		2023
Common stock grants	$	100	$	100
Stock option grants		113		94
Restricted Stock Unit Awards ("RSUs")		1,300		862
Total share-based compensation	$	1,513	$	1,056

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		-			-
Exercised		(4,480	)		35.76
Outstanding at March 31, 2024		74,008		$	58.44		5.34	$	14,340
Exercisable at March 31, 2024		65,823		$	48.22		5.18	$	13,427
Vested and expected to vest at March 31, 2024		74,008		$	58.44		5.34	$	14,340

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		35,334			171.40
Shares vested		(48,794	)		76.29
Shares forfeited		(131	)		171.40
Outstanding at March 31, 2024		82,102		$	85.47