Note 4 - Fair Value Measurements (Tables)

3 Months Ended

Apr. 30, 2019

Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]

	Fair value measurement at reporting date using
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
	(in thousands)
Money market mutual funds as of April 30, 2019	$	119,247
Money market mutual funds as of January 31, 2019	$	107,855
Short-term investments as of April 30, 2019	$	1,200
Short-term investments as of January 31, 2019	$	1,200
Asset related to the interest rate swap as of April 30, 2019			$	45
Asset related to the interest rate swap as of January 31, 2019			$	136

Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]

	Asset
			Fair Value
	Balance Sheet Location		April 30, 2019		January 31, 2019
Derivative instrument:
Interest rate swap		Other assets, net	$	45	$	136
Total			$	45	$	136

- Definition

Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances.

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