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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Cash flows from operating activities:      
Net income (loss) $ 687 $ (668) $ 1,560
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation of property, plant and equipment 145 261 319
Amortization of operating lease right-of-use assets 1,074
Deferred tax benefit 209
Impairment of goodwill 77
Reverse of write down for doubtful receivables (66)
Write-down of inventories 39 419 45
Write-down of property, plant and equipment 233 113
Gain on disposal of property, plant and equipment (16) (28) (50)
Share-based compensation expenses 181
Changes in operating assets and liabilities:      
Accounts receivable 232 (41) 1,246
Inventories (559) 878 (580)
Prepaid expenses and other current assets 58 8 17
Accounts payable (121) 270 (1,507)
Accrued expenses and other current liabilities (570) (850) 852
Operating lease liabilities (909)
Income tax payable 1 (170) 439
Long-term rental prepayment (871)
Long-term deposits (9) 45
Net cash provided by (used in) operating activities 442 (437) 2,388
Cash flows from investing activities:      
Purchase of property, plant and equipment (91) (695) (271)
Payment of long-term loan receivable (75)
Proceeds from disposal of property, plant and equipment 27 34 129
Net cash used in investing activities (64) (736) (142)
Cash flows from financing activities:      
Cash dividends paid (297) (1,244) (1,031)
Net increase (decrease) in cash and cash equivalents 81 (2,417) 1,215
Cash and cash equivalents at the beginning of year 8,827 11,267 10,028
Effect of exchange rate changes on cash and cash equivalents (81) (23) 24
Cash and cash equivalents at the end of year 8,827 8,827 11,267
Supplemental disclosure of cash flow information:      
Income taxes $ 10 $ 144 $ 35