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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Cash flows from operating activities:      
Net income $ 525 $ 1,264 $ 1,143
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation of property, plant and equipment 266 317 393
Write down of amounts receivables 60    
Write down of inventories 41 25 80
Write down of property, plant and equipment 117
Deferred income taxes     (12)
Gain on disposal of property, plant and equipment (110)
Changes in operating assets and liabilities:      
Accounts receivable 858 (1,378) 214
Inventories (834) 687 1,539
Prepaid expenses and other assets 286 249 100
Accounts payable 1,040 (291) 2
Accrued expenses and other liabilities 99 195 697
Income tax payable (121) 103 55
Long-term deposits 4 (32) 122
Net cash provided by operating activities 2,224 1,256 4,223
Investing activities:      
Purchase of property, plant and equipment (197) (524) (129)
Proceeds from disposal of property, plant and equipment   60 110
Acquisition of a subsidiary     (19)
Repayment from long-term loan receivable     184
Release of bank pledged deposit     643
Contribution from a non-controlling shareholder     26
Net cash provided by (used in) investing activities (197) (464) 815
Financing activities:      
Proceed from exercise of employee share options     30
Acquisition of additional interests in a subsidiary (9)    
Cash dividends paid (1,126) (1,364) (758)
Net cash used in financing activities (1,135) (1,364) (728)
Net increase (decrease) in cash and cash equivalents 892 (572) 4,310
Cash and cash equivalents at the beginning of year 9,140 9,727 5,416
Effect of exchange rate changes on cash (4) (15) 1
Cash and cash equivalents at the end of year 10,028 9,140 9,727
Supplemental cash flow information:      
Interest     7
Income taxes $ 350 $ 120 $ 91