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Stock options (Details) - Stock Options - $ / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Number of options      
Outstanding, beginning of year 51,000 0 0
Granted 0 51,000 0
Outstanding, end of year 51,000 51,000 0
Exercisable, end of year 0 0 0
Weighted average exercise price      
Outstanding, beginning of year $ 2.60 $ 0.00 $ 0.00
Granted .00 2.60 0.00
Outstanding, end of year 2.60 2.60 0.00
Exercisable, end of year $ .00 $ 0.00 $ 0.00