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Note 14 - Stock Option Plans (Tables)

12 Months Ended

Dec. 31, 2020

Notes Tables

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

		Year Ended December 31,
		2020				2019				2018
Volatility			39.0	%			36.5	%			37.9	%
Risk-free interest rate			1.8	%			2.0	%			2.7	%
Expected life (in years)			4.54				4.50				4.48
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		$	19.98			$	20.20			$	22.22

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

		Year Ended December 31, 2020								Year Ended December 31, 2019								Year Ended December 31, 2018
		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			754,497			$	49.94				702,337			$	43.80				653,571			$	36.69
Granted			239,325				61.21				180,800				60.56				163,366				62.80
Exercised			(113,132	)			30.53				(80,319	)			16.90				(63,886	)			12.86
Forfeited			(26,468	)			60.29				(31,986	)			59.35				(50,714	)			52.33
Expired			(9,202	)			58.96				(16,335	)			47.51				-				-
Outstanding, end of period			845,020				55.31				754,497				49.94				702,337				43.80
Options exercisable, end of period			401,345			$	49.21				356,066			$	40.64				326,937			$	28.91

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
$15.93 - $19.95			48,564			$	17.77				1.0			$	2,726				48,564			$	17.77				1.0			$	2,726
$21.10 - $27.53			36,250				23.76				1.5				1,817				36,250				23.76				1.5				1,817
$35.25 - $37.35			5,625				36.88				1.5				208				4,375				37.35				1.0				160
$46.90 - $48.00			14,000				47.33				5.2				372				4,750				47.21				3.8				126
$51.82 - $59.98			309,659				55.51				3.5				5,690				233,378				55.49				3.4				4,295
$60.01 - $68.41			410,922				62.07				5.6				4,858				74,028				63.33				4.8				782
$72.50 - $72.50			20,000				72.50				6.9				28				-				-				-				-
			845,020			$	55.31				4.4			$	15,699				401,345			$	49.21				3.2			$	9,906

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

		Year Ended December 31,
		2020				2019				2018
Network expenses		$	472			$	307			$	223
Sales and marketing			1,678				1,251				1,025
Technical operations and development			756				596				636
General and administrative			812				722				690
		$	3,718			$	2,876			$	2,574

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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