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Note 14 - Stock Option Plans (Tables)

12 Months Ended

Dec. 31, 2021

Notes Tables

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

		Year Ended December 31,
		2021				2020				2019
Volatility			35.7	%			39.0	%			36.5	%
Risk-free interest rate			0.8	%			1.8	%			2.0	%
Expected life (in years)			4.60				4.54				4.50
Dividend yield			0.0	%			0.0	%			0.0	%
The weighted average grant date fair value for options issued, with the exercise price equal to market value on the date of grant		$	24.83			$	19.98			$	20.20

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

		Year Ended December 31, 2021								Year Ended December 31, 2020								Year Ended December 31, 2019
		Number of shares				Weighted average exercise price per share				Number of shares				Weighted average exercise price per share				Number of shares				Weighted average exercise price per share
Outstanding, beginning of period			845,020			$	55.31				754,497			$	49.94				702,337			$	43.80
Granted			282,625				79.30				239,325				61.21				180,800				60.56
Exercised			(179,321	)			45.04				(113,132	)			30.53				(80,319	)			16.90
Forfeited			(41,240	)			65.72				(26,468	)			60.29				(31,986	)			59.35
Expired			(2,933	)			60.70				(9,202	)			58.96				(16,335	)			47.51
Outstanding, end of period			904,151				64.36				845,020				55.31				754,497				49.94
Options exercisable, end of period			415,925			$	56.44				401,345			$	49.21				356,066			$	40.64

Share-based Payment Arrangement, Option, Exercise Price Range [Table Text Block]

		Options outstanding																Options exercisable
Exercise price		Number outstanding				Weighted average exercise price per share				Weighted average remaining contractual life (years)				Aggregate intrinsic value				Number exercisable				Weighted average exercise price per share				Weighted average remaining contractual life (years)				Aggregate intrinsic value
$19.95 - $19.95			7,000			$	19.95				1.1			$	447				7,000			$	19.95				1.1			$	447
$21.10 - $21.10			20,892				21.10				1.0				1,310				20,892				21.10				1.0				1,310
$46.90 - $48.00			12,000				47.31				4.0				438				6,000				47.17				2.7				220
$51.82 - $59.98			227,340				55.59				2.6				6,418				215,315				55.58				2.5				6,080
$60.01 - $68.41			345,294				62.02				4.6				7,528				154,018				63.11				4.2				3,189
$72.50 - $79.51			275,125				78.68				6.2				1,413				12,700				72.61				5.9				142
$80.61 - $82.07			16,500				81.27				6.8				42				-				-				-				-
			904,151			$	64.36				4.5			$	17,596				415,925			$	56.44				3.1			$	11,388

Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]

		Year Ended December 31,
		2021				2020				2019
Network expenses		$	531			$	472			$	307
Sales and marketing			1,941				1,678				1,251
Technical operations and development			824				756				596
General and administrative			1,296				812				722
		$	4,592			$	3,718			$	2,876

X

- Definition

Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement.

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