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6. INCOME TAXES - Tax Cuts and Jobs Act (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
Corporate income tax rate | 35.00% | 21.00% | 21.00% | 21.00% |
Tax expense, one-time transition tax |  |  |  |  | $ 367,000
Cash, cash equivalents and short-term and long-term investments |  | $ 59,700,000 |  |  |
Possible reduction in uncertain tax benefits |  | 0 |  |  |
Valuation allowance |  | 13,017,000 | $ 9,389,000 |  |
Valuation allowance, increase |  | 3,600,000 |  |  |
Federal net operating loss |  |  | $ 378,000 |  |
Federal |  |  |  |  |
Net operating loss carryforwards for income tax purposes |  | 9,600,000 |  |  |
Tax credit carryforwards for income tax purposes |  | 3,700,000 |  |  |
State |  |  |  |  |
Net operating loss carryforwards for income tax purposes |  | 14,500,000 |  |  |
Tax credit carryforwards for income tax purposes |  | $ 4,200,000 |  |  |

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