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Stockholders’ equity (Tables)
 6 Months Ended
Jun. 30, 2023
Equity [Abstract]  
Schedule of repurchase of common stock

 

Period   Total number of shares purchased   Average price paid per share   Total number of shares purchased as part of publicly announced plans or programs   Maximum number (or approximate dollar value) of shares that may yet be purchased under the plans or programs 
April 1 through April 30, 2023    0    N/A    44,748    255,252 
May 1 through May 31, 2023    0    N/A    44,748    255,252 
June 1 through June 30, 2023    22,400   $0.027    67,148    232,852 
TOTAL    22,400   $0.027    67,148    232,852