Note 3 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Jan. 31, 2018	Jan. 31, 2017
Allowance for doubtful accounts and sales adjustments	$ 367	$ 356
Accrued vacation	1,590	2,033
Tax credits	18,583	13,116
Deferred revenue	3,493	3,465
Net operating loss carry forwards	10,337	10,255
Accrued expenses - other	1,849	1,695
Other comprehensive income	1,164
Section 263(a) interest capitalization	206	322
Equity compensation	4,380	5,399
Other	1,243	2,039
Total deferred tax assets	43,212	38,680
Less valuation allowance	(33,665)	(29,868)
Less netting of unrecognized tax benefits against deferred tax assets	(930)	(954)
Deferred tax assets, net of valuation allowance	8,617	7,858
Depreciation and amortization	(442)	(630)
Other comprehensive income		(1,009)
Other	(231)	(53)
Total deferred tax liabilities	(673)	(1,692)
Total net deferred tax assets	$ 7,944	$ 6,166