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Note 17 - Stock-based Compensation Plans (Tables)

12 Months Ended

Jan. 31, 2021

Notes Tables

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

Year Ended			January 31,				January 31,				January 31,
			2021				2020				2019
Cost of revenues			319				220				160
Sales and marketing			896				706				436
Research and development			404				281				184
General and administrative			4,694				3,702				2,930
Effect on net income			6,313				4,909				3,710

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

Year Ended			January 31, 2021				January 31, 2020				January 31, 2019
Expected dividend yield (%)			-				-				-
Expected volatility (%)			26.4				23.5				23.6
Risk-free rate (%)			0.7				1.4				2.0
Expected option life (years)			5				5				5

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

			Number of Stock Options Outstanding				Weighted- Average Exercise Price				Weighted- Average Remaining Contractual Life (years)				Aggregate Intrinsic Value (in millions)
Balance at January 31, 2019			879,338			$	21.41				4.7			$	8.7
Granted			367,173			$	38.06
Exercised			(94,970	)		$	15.62
Forfeited			(23,719	)		$	31.93
Balance at January 31, 2020			1,127,822			$	26.82				4.6			$	20.2
Granted			381,859			$	41.51
Exercised			(338,342	)		$	18.43
Forfeited			(23,619	)		$	33.88
Balance at January 31, 2021			1,147,720			$	33.77				4.9			$	28.1
Vested or expected to vest at January 31, 2021			1,147,720			$	33.77				4.9			$	28.1
Exercisable at January 31, 2021			646,065			$	29.52				4.3			$	18.6

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

				Options Outstanding												Options Exercisable
Range of Exercise Prices					Weighted Average Exercise Price				Number of Stock Options				Weighted Average Remaining Contractual Life (years)				Weighted Average Exercise Price				Number of Stock Options
$11.32	–	$22.34		$	21.06				220,559				2.9			$	21.01				203,459
$25.65	–	$27.23		$	27.22				217,381				4.2			$	27.23				186,707
$37.66	–	$39.30		$	38.09				636,869				5.7			$	37.96				255,899
$49.04	–	$55.04		$	54.11				72,911				6.7				-				-
				$	33.77				1,147,720				4.9			$	29.52				646,065

Schedule of Nonvested Share Activity [Table Text Block]

			Number of Stock Options Outstanding				Weighted- Average Grant-Date Fair Value per Share
Balance at January 31, 2019			325,218			$	6.18
Granted			367,173			$	8.99
Vested			(259,269	)		$	6.96
Forfeited			(23,469	)		$	7.69
Balance at January 31, 2020			409,653			$	8.03
Granted			381,859			$	10.19
Vested			(266,238	)		$	8.19
Forfeited			(23,619	)		$	4.87
Balance at January 31, 2021			501,655			$	9.52

Share-based Payment Arrangement, Performance Shares, Outstanding Activity [Table Text Block]

			Number of PSUs Outstanding				Weighted- Average Granted Date Fair Value				Weighted- Average Remaining Contractual Life (years)				Aggregate Intrinsic Value (in millions)
Balance at January 31, 2019			530,383			$	18.02				5.5			$	16.6
Granted			53,729			$	53.65
Performance units issued			45,762			$	23.24
Balance at January 31, 2020			629,874			$	21.19				5.0			$	28.2
Granted			85,334			$	54.24
Performance units issued			40,665			$	29.08
Balance at January 31, 2021			755,873			$	25.17				4.7			$	44.0
Vested or expected to vest at January 31, 2021			755,873			$	25.17				4.7			$	44.0
Exercisable at January 31, 2021			562,459			$	17.21				3.5			$	32.8

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

			Number of RSUs Outstanding				Weighted- Average Granted Date Fair Value				Weighted- Average Remaining Contractual Life (years)				Aggregate Intrinsic Value (in millions)
Balance at January 31, 2019			337,066			$	14.42				5.6			$	10.6
Granted			37,611			$	38.04
Balance at January 31, 2020			374,677			$	16.57				5.0			$	16.8
Granted			57,518			$	43.25
Balance at January 31, 2021			432,195			$	19.98				4.7			$	25.2
Vested or expected to vest at January 31, 2021			432,195			$	19.98				4.7			$	25.2
Exercisable at January 31, 2021			375,845			$	16.50				4.1			$	21.9

Schedule Of Cash Settled Restricted Share Unit Plan Activity [Table Text Block]

			Number of CRSUs Outstanding				Weighted- Average Remaining Contractual Life (years)
Balance at January 31, 2019			45,063				1.6
Granted			30,086
Vested and settled in cash			(32,422	)
Balance at January 31, 2020			42,727				1.6
Granted			26,629
Vested and settled in cash			(30,340	)
Forfeited			(248	)
Balance at January 31, 2021			38,628				1.5
Non-vested at January 31, 2021			38,628				1.5

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