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3. Accrued product warranty liability (Details) (USD $)	Mar. 31, 2015
Product Warranties Disclosures [Abstract]
Product Warranty Accrual, Current	$ 174,000
Product Warranty Accrual, Noncurrent	$ 82,000

Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers. For classified balance sheets, represents the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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