Quarterly report pursuant to Section 13 or 15(d)

Marketable securities (Details)

v3.22.2
Marketable securities (Details) - USD ($)
Jun. 30, 2022
Dec. 31, 2021
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items]    
Marketable securities $ 3,948,930 $ 6,064,097
Fair Value, Inputs, Level 1 [Member]    
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items]    
Marketable securities
Fair Value, Inputs, Level 2 [Member]    
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items]    
Marketable securities 3,948,930 6,064,097
Corporate Debt Securities [Member]    
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items]    
Marketable securities 3,453,873 5,549,670
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items]    
Marketable securities
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items]    
Marketable securities 3,453,873 5,549,670
Certificates of Deposit [Member]    
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items]    
Marketable securities 495,057 514,427
Certificates of Deposit [Member] | Fair Value, Inputs, Level 1 [Member]    
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items]    
Marketable securities
Certificates of Deposit [Member] | Fair Value, Inputs, Level 2 [Member]    
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items]    
Marketable securities $ 495,057 $ 514,427