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10. Inccome taxes (Details - Reconciliation) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Federal income tax expense computed at the statutory rate	$ 1,917	$ 1,357
State and local tax expense, net	320	337
U.S. domestic manufacturers' deduction & other permanent differences	113	300
Additions for tax positions of prior years	(202)	50
Change in tax rates	2	0
Change in tax estimate	8	(24)
Provision for income taxes	$ 2,158	$ 2,020
Federal income tax expense computed at the statutory rate, percentage	34.00%	34.00%
State and local tax expense, net, percentage	5.70%	8.40%
U.S. domestic manufacturers' deduction & other permanent differences, percentage	2.00%	7.50%
Additions for tax positions of prior years, percentage	(3.50%)	1.30%
Change in tax rates, percentage	0.00%	0.00%
Change in tax estimate, percentage	0.10%	(0.60%)
Provision for income taxes, percentage	38.30%	50.60%

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