Quarterly report pursuant to Section 13 or 15(d)

Marketable securities (Details)

v3.23.1
Marketable securities (Details) - USD ($)
Mar. 31, 2023
Dec. 31, 2022
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items]    
Marketable securities $ 2,434,551 $ 2,927,518
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 2,434,551 2,927,518
Fair Value, Inputs, Level 3 [Member]    
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items]    
Marketable securities
Corporate Debt Securities [Member]    
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items]    
Marketable securities 1,939,636 2,436,333
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 1,939,636 2,436,333
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items]    
Marketable securities
Certificates of Deposit [Member]    
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items]    
Marketable securities 494,915 491,185
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 494,915 491,185
Certificates of Deposit [Member] | Fair Value, Inputs, Level 3 [Member]    
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items]    
Marketable securities