13. Income taxes (Details) - Deferred Income Tax Components (USD $)	Dec. 31, 2013	Dec. 31, 2012
Deferred tax assets:
Foreign net operating losses	$ 242,000	$ 186,000
Capitalized research and development	68,000	136,000
Inventory reserves	1,050,000	961,000
Deferred revenue	59,000	79,000
Warranty reserve	127,000	96,000
Stock compensation expense	956,000	1,036,000
Foreign tax and other credits	45,000	34,000
Other liabilities and reserves	491,000	705,000
Gross deferred tax assets	3,038,000	3,233,000
Valuation allowance	(242,000)	(216,000)
Net deferred tax assets	2,796,000	3,017,000
Deferred tax liabilities:
Depreciation	175,000	365,000
Other	46,000	37,000
Net deferred tax liabilities	221,000	402,000
Total net deferred tax assets	$ 2,575,000	$ 2,615,000

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Represents the noncurrent portion of deferred tax liabilities, which result from applying the applicable tax rate to net taxable temporary differences pertaining to each jurisdiction to which the entity is obligated to pay income tax and the aggregate carrying amount, as of the balance sheet date, of noncurrent obligations not separately disclosed in the balance sheet. Noncurrent liabilities are expected to be paid after one year (or the normal operating cycle, if longer).