Amount of income (loss) for proportionate share of equity method investee's income (loss).

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Name:	us-gaap_IncomeLossFromEquityMethodInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Equity Method Investments (Narrative) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Earnings of equity method investment	$ 30,000		$ 84,000
Investment in related party	$ 3,509,000		3,509,000
Capital distribution			$ 84,000
StockCross [Member]
Percentage of outstanding shares purchased by company			15.00%
Shares purchased			922,875
Per share price	$ 3.97		$ 3.97
Investment in related party	$ 3,509,000		$ 3,509,000
Capital distribution			1,600,000
StockCross [Member] \| Siebert [Member]
Capital distribution			$ 241,000