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1. THE COMPANY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Recent accounting pronouncements (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Mar. 31, 2020 | Apr. 01, 2019
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Operating lease right-of-use assets | $ 677 | $ 617 |
Lease liabilities, operating lease | $ 699 | $ 640 |
ASU 2016-02 | Restatement |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Operating lease right-of-use assets |  |  | $ 1,100
Lease liabilities, operating lease |  |  | $ 1,100

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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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