Note 4 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Jan. 31, 2021	Jan. 31, 2020
Allowance for doubtful accounts and sales adjustments	$ 700	$ 600
Accrued vacation	1,305	1,499
Tax credits	24,312	22,077
Deferred revenue	2,670	3,136
Lease liabilities	5,046	4,142
Net operating loss carryforwards	13,794	15,475
Accrued expenses - other	2,543	2,038
Other comprehensive income	3,624	1,603
Section 263(a) interest capitalization	182	190
Intellectual property	4,583	6,250
Equity compensation	4,219	3,579
Carryforward of Irish amortization	5,728	3,614
Other	718	1,767
Total deferred tax assets	69,424	65,970
Less valuation allowance	(48,571)	(50,972)
Less netting of unrecognized tax benefits against deferred tax assets	(968)	(973)
Deferred tax assets, net of valuation allowance	19,885	14,025
Depreciation and amortization	(612)	(851)
Acquisition accounting basis differences	(2,514)	0
Costs to obtain and fulfill contracts	(3,081)	(3,054)
ASC 842 lease right of use assets	(4,756)	(3,931)
Other liabilities	(396)	(355)
Total deferred tax liabilities	(11,359)	(8,191)
Total net deferred tax assets	$ 8,526	$ 5,834