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Marketable Investment Securities (Details Narrative) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Investments, Debt and Equity Securities [Abstract]        
Available-for-sale securities, gross realized gain (loss) $ 0 $ 0 $ 0 $ 0
Proceeds from sale and maturity of marketable securities 0 0 450,000 4,300,000
Other-than-temporary impairments $ 0 $ 0 $ 0 $ 0