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Significant accounting policies - Additional information (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
May 18, 2020
Class of Stock [Line Items]            
Cumulative dividends percentage 8.00%   8.00%   8.00%  
State income tax payments made $ 12,231 $ 2,000 $ 12,231 $ 2,000    
Series A preferred stock (if converted)            
Class of Stock [Line Items]            
Minimum Conversion Price           $ 1,000
Per share of final price           $ 18.054
Cumulative dividends percentage           8.00%
Timber Sub | Redeemable Series A Convertible Preferred Stock            
Class of Stock [Line Items]            
Temporary Equity, Accretion to Redemption Value     $ 2,200,000   $ 2,100,000