Note 7 - Income Taxes - Deferred Tax Assets (Details) - USD ($) $ in Thousands	Jan. 31, 2021	Jan. 31, 2020
U.S. Federal NOL carryforward	$ 8,626	$ 7,209
Deferred compensation	508	401
Research tax credit	2,686	2,686
Foreign NOL carryforward	543	223
Foreign tax credit	2,580	2,580
Stock compensation	442	429
Other accruals not yet deducted	245	267
State NOL carryforward	2,678	2,567
Accrued commissions and incentives	362	354
Inventory valuation allowance	106	75
Lease liability	541	604
Other	113	127
Deferred tax assets, gross	19,430	17,522
Valuation allowance	(17,746)	(15,937)
Total deferred tax assets, net of valuation allowances	1,684	1,585
Depreciation	(981)	(1,275)
Foreign subsidiaries unremitted earnings	(289)	(470)
Prepaid	(21)	(61)
Right of use asset	(484)	(538)
Total deferred tax liabilities	(1,775)	(2,344)
Deferred tax liability, net	(91)	(759)
Long-term assets	823	293
Long-term liability	$ (914)	$ (1,052)