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10. Inccome taxes (Details - Reconciliation) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Federal income tax expense computed at the statutory rate	$ 259	$ (695)
State and local tax expense, net	180	(47)
Goodwill impairment	0	324
Other permanent differences	14	147
Section 162m	105	0
Stock based compensation	149	0
Uncertain tax positions	79	0
Change in tax rates	8	(37)
Change in tax estimate	(12)	83
Provision (benefit) for income taxes	$ 782	$ (225)
Federal income tax expense computed at the statutory rate, percentage	21.00%	21.00%
State and local tax expense, net, percentage	14.50%	1.40%
Goodwill impairment, percentage	0.00%	(9.80%)
Other permanent differences, percentage	1.10%	(4.40%)
Section 162m, percentage	8.50%	0.00%
Stock based compensation, percentage	12.10%	0.00%
Uncertain tax positions, percentage	6.40%	0.00%
Change in tax rates, percentage	0.70%	1.10%
Change in tax estimate, percentage	(1.00%)	(2.50%)
Benefit for income taxes, percentage	63.30%	6.80%

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Name:	us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration