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6. INCOME TAXES - Deferred tax assets and liabilities (Details) - USD ($)
Mar. 31, 2025
Mar. 31, 2024
Deferred tax assets:    
Tax credits $ 10,242,000 $ 9,572,000
Net operating losses 5,933,000 4,807,000
Capitalized research and development 4,429,000 3,407,000
Stock-based compensation 1,187,000 1,168,000
Property and equipment 209,000 474,000
Operating lease liabilities 2,103,000 18,000
Other reserves and accruals 753,000 730,000
Total deferred tax assets 24,856,000 20,176,000
Valuation allowance (22,794,000) (20,165,000)
Total deferred tax assets 2,062,000 11,000
Deferred tax liabilities:    
Right of use assets (2,078,000) (25,000)
Total deferred tax liabilities (2,078,000) (25,000)
Net deferred tax liability (16,000) $ (14,000)
Deferred tax liabilities, undistributed foreign earnings $ 0