Note 7 - Income Taxes - Deferred Tax Assets (Details) - USD ($) $ in Thousands	Jan. 31, 2022	Jan. 31, 2021
U.S. Federal NOL carryforward	$ 8,424	$ 8,626
Deferred compensation	350	508
Research tax credit	2,573	2,686
Foreign NOL carryforward	448	543
Foreign tax credit	2,580	2,580
Stock compensation	62	442
Other accruals not yet deducted	276	245
State NOL carryforward	2,730	2,678
Accrued commissions and incentives	483	362
Inventory valuation allowance	116	106
Lease liability	418	541
Accrued pension	0	18
Other	17	95
Deferred tax assets, gross	18,477	19,430
Valuation allowance	(16,905)	(17,746)
Total deferred tax assets, net of valuation allowances	1,572	1,684
Depreciation	(643)	(981)
Foreign subsidiaries unremitted earnings	(231)	(289)
Prepaid	(54)	(21)
Accrued pension	(159)	0
Right of use asset	(386)	(484)
Total deferred tax liabilities	(1,473)	(1,775)
Deferred tax asset/(liability), net	99	91
Deferred tax asset/(liability), net	(99)	(91)
Long-term assets	811	823
Long-term liability	$ (712)	$ (914)