Revenue Recognition (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Revenue from Contract with Customer [Abstract]
Stock borrow / stock loan	$ 11,864,000	$ 4,045,000
Gross revenue from stock borrow/ Stock loan	29,441,000	10,068,000
Expenses from stock borrow/stock loan	17,577,000	6,023,000
Client expenses	625,000	$ 693,000
Other receivables	30,000
Accounts payable and accrued liabilities	$ 247,000