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7. Shareholders' Equity (Details) - USD ($)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Equity [Abstract]    
Accumulated other comprehensive income, beginning balance $ 179,939 $ 27,179
Other comprehensive income before reclassifications 169,998 277,735
Amounts reclassified from AOCI into interest income (192,983) 0
Accumulated other comprehensive income, ending balance $ 156,954 $ 304,914