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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Cash flows from operating activities      
Net loss $ (4,934) $ (2,808) $ (7,490)
Adjustments to reconcile net loss to net cash provided by operating activities:      
Depreciation and amortization 2,373 2,824 3,621
Provision for doubtful accounts, net 274 73 (19)
Allowances for obsolete inventories, net (252) 341 134
Impairment of property, plant and equipment 490
(Gain) loss on disposal of property, plant and equipment 420 (766) (392)
Unrealized holding (gain) loss on marketable securities 1,860 (954) 865
Gain on sales of marketable securities (526) (102)
Impairment of goodwill 392
Stock-based compensation expenses 199
Deferred income tax 21 115 277
Changes in operating assets and liabilities:      
Accounts receivable 95 (1,724) 384
Inventories 2,966 (157) 230
Prepaid expenses and other current assets 462 (646) (322)
Accounts payable (1,120) 683 (479)
Accrued payroll and employee benefits (193) (163) 258
Customer deposits (1,027) 670 526
Other accrued liabilities 88 (36) (23)
Income taxes payable 56 81 (330)
Net cash provided by (used in) operating activities 563 (2,370) (1,878)
Cash flows from investing activities      
Purchase of property, plant and equipment (591) (890) (853)
Proceeds from sale of property, plant and equipment, net of transaction costs 1,266 976 1,086
Purchase of marketable securities (10,349) (4,455)
Proceeds from sales of marketable securities 6,798 1,011
(Increase in) release of fixed deposits maturing over three months 4,635 1,347 (2,574)
Increase in fixed deposits maturing over twelve months (2,965) (1,601)
Net cash used in investing activities (1,206) (3,612) (2,341)
Cash flows from financing activities      
Dividends paid (1,686) (2,971) (3,615)
Proceeds from exercise of stock options 493
Repurchase of common stock   (1,411)
Net cash used in financing activities (1,686) (2,971) (4,533)
Net decrease in cash and cash equivalents (2,329) (8,953) (8,752)
Cash and cash equivalents, beginning of year 14,325 23,278 32,030
Cash and cash equivalents, end of year 11,996 14,325 23,278
Cash paid during the year for:      
Interest
Income taxes $ 25 $ 7 $ 685