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9. Inccome taxes (Details - Reconciliation) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Federal income tax expense computed at the statutory rate	$ (695)	$ (274)
State and local tax expense, net	(47)	1
Goodwill impairment	324	0
U.S. domestic manufacturers' deduction & other permanent differences	147	111
Additions for tax positions of prior years	0	118
Change in tax rates	(37)	(378)
Change in tax estimate	83	(36)
Provision for income taxes	$ (225)	$ (458)
Federal income tax expense computed at the statutory rate, percentage	21.00%	34.00%
State and local tax expense, net, percentage	1.40%	(0.10%)
Goodwill impairment	(9.80%)	0.00%
U.S. domestic manufacturers' deduction & other permanent differences, percentage	(4.40%)	(13.80%)
Additions for tax positions of prior years, percentage	0.00%	(14.60%)
Change in tax rates, percentage	1.10%	47.00%
Change in tax estimate, percentage	(2.50%)	4.50%
Provision for income taxes, percentage	6.80%	57.00%

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