Quarterly report pursuant to Section 13 or 15(d)

Marketable securities (Details)

v3.22.1
Marketable securities (Details) - USD ($)
Mar. 31, 2022
Dec. 31, 2021
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items]    
Marketable securities $ 9,827,969 $ 13,039,399
Fair Value, Inputs, Level 1 [Member]    
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items]    
Marketable securities 3,849,926 6,975,302
Fair Value, Inputs, Level 2 [Member]    
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items]    
Marketable securities 5,978,043 6,064,097
Corporate Debt Securities [Member]    
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items]    
Marketable securities 5,472,730 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 5,472,730 5,549,670
Certificates of Deposit [Member]    
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items]    
Marketable securities 505,313 514,427
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 505,313 514,427
Money Market Funds [Member]    
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items]    
Marketable securities 3,849,926 6,975,302
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]    
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items]    
Marketable securities 3,849,926 6,975,302
Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member]    
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items]    
Marketable securities