Quarterly report pursuant to Section 13 or 15(d)

Long-Term Bonds Payable and Restricted Cash (Details)

v3.21.1
Long-Term Bonds Payable and Restricted Cash (Details) - USD ($)
Mar. 31, 2021
Dec. 31, 2020
Gross $ 10,200,000 $ 10,200,000
Unamortized loan fee (934,341) (981,906)
Net 9,265,659 9,218,094
Credit Enhanced Zero Coupon Convertible Bonds [Member]    
Aggregate principal amount 10,000,000 10,000,000
Coupon Bonds [Member]    
Aggregate principal amount $ 200,000 $ 200,000