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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Cash flows from operating activities:      
Net (loss) income $ (454) $ 687 $ (668)
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation of property, plant and equipment 159 145 261
Amortization of operating lease right-of-use assets 841 1,074
Deferred tax 349 209
Impairment of goodwill 77
Write-down of inventories 125 39 419
Write-down of property, plant and equipment 233
Gain on disposal of property, plant and equipment (9) (16) (28)
Share-based compensation expenses 93 181
Changes in operating assets and liabilities:      
Accounts receivable 1,017 232 (41)
Inventories (301) (559) 878
Prepaid expenses and other current assets (112) 58 8
Accounts payable (390) (121) 270
Accrued expenses and other current liabilities (87) (570) (850)
Operating lease liabilities (795) (909)
Income tax payable (521) 1 (170)
Long-term rental prepayment (871)
Long-term deposits (19) (9) 45
Net cash (used in) provided by operating activities (104) 442 (437)
Cash flows from investing activities:      
Purchase of property, plant and equipment (88) (91) (695)
Payment of long-term loan receivable (75)
Proceeds from disposal of property, plant and equipment 10 27 34
Net cash used in investing activities (78) (64) (736)
Cash flows from financing activities:      
Options exercised 79
Cash dividends paid (981) (297) (1,244)
Net cash used in financing activities (902) (297) (1,244)
Net (decrease) increase in cash and cash equivalents (1,084) 81 (2,417)
Cash and cash equivalents at the beginning of year 8,827 8,827 11,267
Effect of exchange rate changes on cash and cash equivalents 14 (81) (23)
Cash and cash equivalents at the end of year 7,757 8,827 8,827
Supplemental disclosure of cash flow information:      
Income taxes $ 27 $ 10 $ 144