Note 4 - Income Taxes - Reconciliation of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2019
Computed expected tax expense (benefit)	$ 2,272	$ (757)	$ 2,503
State income taxes, net of federal income tax expense	272	(581)	96
Incremental tax expense from foreign operations	1,708	1,256	715
Equity compensation	(958)	(4,198)	(2,916)
Foreign withholding taxes	1,619	1,103	1,089
Net change in valuation allowance	(3,438)	16,179	3,224
Net change in uncertain tax positions	125	3	(71)
Non-deductible expenses	(41)	218	1,149
Benefit of tax credits	(2,569)	(1,719)	(3,483)
Subpart F income	611	27	101
U.S. Tax Reform (the Tax Act)	0	0	(1,312)
Rate change impact	123	867	124
Other	32	(53)	270
Total income tax (benefit) expense	$ (244)	$ 12,345	$ 1,489