Summary of Significant Accounting Policies (Components of Accumulated Other Comprehensive Loss) (Details)	3 Months Ended
	Mar. 31, 2021 USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 47,494,727
Ending balance	45,721,931
Foreign Currency Translation [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(700,000)
Net current period change	20,000
Ending balance	(680,000)
Unrealized gain (loss) on securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	21,000
Net current period change	(9,000)
Ending balance	12,000
Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(678,767)
Net current period change	11,000
Ending balance	$ (668,335)