Income Taxes (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2019
Operating Loss Carryforwards [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent			21.00%			36.00%
Deferred Tax Assets, Other			$ 2,600,000
Income tax expense (benefit) [Abstract]
Federal current	$ (57,000)	$ 116,000	0	$ 116,000
Federal deferred	(827,000)	428,000	(1,926,000)	621,000
Foreign current	414,000	476,000	1,102,000	596,000
Foreign deferred	199,000	1,320,000	1,236,000	1,435,000
State current	7,000	22,000	16,000	41,000
State deferred	16,000	2,000	80,000	94,000
Total income tax expense (benefit)	(248,000)	2,364,000	508,000	2,903,000
Deferred tax assets:
Deferred Tax Assets, Gross	5,649,000		5,649,000				$ 7,793,000
Valuation allowances	(3,167,000)		(3,167,000)				(2,761,000)
Net deferred tax assets	2,482,000		2,482,000				5,032,000
Deferred tax liabilities:
Deferred tax liabilities	5,405,000		5,405,000				4,449,000
State Administration of Taxation, China [Member]
Income tax expense (benefit) [Abstract]
Foreign deferred	200,000	$ 1,700,000	$ 1,300,000	$ 1,700,000.0
Effective Income Tax Rate Reconciliation, Tax Settlement, Foreign, Percent			10.00%
Domestic Country [Member]
Deferred tax assets:
Deferred Tax Assets, Gross	1,845,000		$ 1,845,000				4,385,000
Deferred tax liabilities:
Tax Credit Carryforward, Amount	2,800,000		2,800,000				4,400,000
Foreign Country [Member]
Deferred tax assets:
Deferred Tax Assets, Gross	2,147,000		2,147,000				2,020,000
Valuation allowances	(1,800,000)		(1,800,000)				(1,700,000)
Deferred tax liabilities:
Deferred tax liabilities	5,405,000		5,405,000				4,449,000
State and Local Jurisdiction [Member]
Deferred tax assets:
Deferred Tax Assets, Gross	1,657,000		1,657,000				1,388,000
Valuation allowances	(1,400,000)		$ (1,400,000)				$ (1,100,000)
Blackstone Transaction [Member] | CityOn.Xi'an [Member]
Income tax expense (benefit) [Abstract]
Equity Method Investment, Summarized Financial Information, Ownership Interest Sold			50.00%
Blackstone Transaction [Member] | CityOn.Zhengzhou [Member]
Income tax expense (benefit) [Abstract]
Equity Method Investment, Summarized Financial Information, Ownership Interest Sold			50.00%
Coronavirus Aid, Relief, and Economic Security Act (CARES Act) [Member]
Operating Loss Carryforwards [Line Items]
Net Operating Loss					$ 12,800,000
Federal Tax Refund			$ 4,500,000
Proceeds from Income Tax Refunds			3,400,000
Income Taxes Receivable	$ 1,100,000		1,100,000
Other Tax Expense (Benefit)			$ 1,900,000