Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies (Components of Accumulated Other Comprehensive Loss) (Details)

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Summary of Significant Accounting Policies (Components of Accumulated Other Comprehensive Loss) (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance $ 47,392,282 $ 41,653,127
Ending balance 47,494,727 47,392,282
Foreign Currency Translation [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (709,000) (764,000)
Net current period change 9,000 55,000
Ending balance (700,000) (709,000)
Unrealized gain (loss) on securities [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance 11,000 13,000
Net current period change 10,000 (2,000)
Ending balance 21,000 11,000
Accumulated Other Comprehensive Loss [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (697,664) (751,293)
Net current period change 19,000 53,000
Ending balance $ (678,767) $ (697,664)