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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Cash flows from operating activities:      
Net income (loss) $ (668) $ 1,560 $ 525
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation of property, plant and equipment 261 319 266
Impairment of goodwill 77
Write-down (reverse of write down) for doubtful receivables (66) 60
Write-down of inventories 419 45 41
Write-down of property, plant and equipment 233 113
Gain on disposal of property, plant and equipment (28) (50)
Changes in operating assets and liabilities:      
Accounts receivable (41) 1,246 858
Inventories 878 (580) (834)
Prepaid expenses and other current assets 8 17 286
Accounts payable 270 (1,507) 1,040
Accrued expenses and other current liabilities (850) 852 99
Income tax payable (170) 439 (121)
Long-term rental prepayment (871)
Long-term deposits 45 4
Net cash provided by (used in) operating activities (437) 2,388 2,224
Cash flows from investing activities:      
Purchase of property, plant and equipment (695) (271) (197)
Payment of long-term loan receivable (75)
Proceeds from disposal of property, plant and equipment 34 129
Net cash used in investing activities (736) (142) (197)
Cash flows from financing activities:      
Acquisition of additional interests in a subsidiary (9)
Cash dividends paid (1,244) (1,031) (1,126)
Net cash used in financing activities (1,244) (1,031) (1,135)
Net increase (decrease) in cash and cash equivalents (2,417) 1,215 892
Cash and cash equivalents at the beginning of year 11,267 10,028 9,140
Effect of exchange rate changes on cash and cash equivalents (23) 24 (4)
Cash and cash equivalents at the end of year 8,827 11,267 10,028
Supplemental disclosure of cash flow information:      
Income taxes $ 144 $ 35 $ 350