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Basis of presentation (Details)
$ in Millions
Oct. 16, 2020
USD ($)
shares
Jun. 30, 2021
USD ($)
Manufacturer
May 01, 2020
USD ($)
Basis of presentation [Abstract]      
Number of manufacturers in China and Thailand | Manufacturer   2  
Proceeds from Public Offering $ 8.7    
Shares sold in Public Offering (in shares) | shares 1,380,000    
PPP Loan [Member]      
Basis of presentation [Abstract]      
Face amount     $ 2.2
Revolving Credit Facility [Member]      
Basis of presentation [Abstract]      
Maximum borrowing capacity   $ 10.0