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Concentration of credit risk (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Jun. 30, 2022
Concentration Risk [Line Items]        
Schedules of Concentration of Risk, by Risk Factor [Table Text Block] Domestic and international sales from operations are as follows:
( in thousands)For the Three Months Ended September 30,
20222021
Domestic$1,620 62.2 %$1,625 60.7 %
Foreign985 37.8 %$1,050 39.3 %
Total$2,605 100 %$2,675 100 %
     
Revenues $ 2,604,816 $ 2,675,069    
Customer Concentration Risk [Member] | Customer One [Member]        
Concentration Risk [Line Items]        
Concentration Risk, Customer No One    
Geographic Concentration Risk [Member]        
Concentration Risk [Line Items]        
Revenues   $ 2,675,000    
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Customer One [Member]        
Concentration Risk [Line Items]        
Concentration Risk, Percentage 13.00%      
Revenue Benchmark [Member] | Geographic Concentration Risk [Member]        
Concentration Risk [Line Items]        
Concentration Risk, Percentage 100.00% 100.00%    
Revenues $ 2,605,000 $ 2,675,000    
Accounts Payable Benchmark [Member] | Supplier Concentration Risk [Member]        
Concentration Risk [Line Items]        
Concentration Risk, Supplier two   one  
Accounts Receivable Benchmark [Member]        
Concentration Risk [Line Items]        
Concentration Risk, Customer one      
Accounts Receivable        
Concentration Risk [Line Items]        
Concentration Risk, Customer one three   one
Accounts Receivable | Customer Concentration Risk [Member] | Customer One [Member]        
Concentration Risk [Line Items]        
Concentration Risk, Percentage 11.00%     13.00%
Domestic [Member] | Geographic Concentration Risk [Member]        
Concentration Risk [Line Items]        
Revenues   $ 1,625,000    
Domestic [Member] | Revenue Benchmark [Member] | Geographic Concentration Risk [Member]        
Concentration Risk [Line Items]        
Concentration Risk, Percentage 62.20% 60.70%    
Revenues   $ 1,625,000    
International [Member] | Revenue Benchmark [Member] | Geographic Concentration Risk [Member]        
Concentration Risk [Line Items]        
Concentration Risk, Percentage 37.80% 39.30%    
Revenues $ 985,000 $ 1,050,000    
Supplier one [Member] | Revenue Benchmark [Member] | Supplier Concentration Risk [Member]        
Concentration Risk [Line Items]        
Concentration Risk, Percentage 38.00% 32.00%    
Supplier one [Member] | Accounts Payable Benchmark [Member] | Supplier Concentration Risk [Member]        
Concentration Risk [Line Items]        
Concentration Risk, Percentage 33.00%     36.00%
Supplier two [Member] | Revenue Benchmark [Member] | Supplier Concentration Risk [Member]        
Concentration Risk [Line Items]        
Concentration Risk, Percentage   13.00%    
Supplier two [Member] | Accounts Payable Benchmark [Member] | Supplier Concentration Risk [Member]        
Concentration Risk [Line Items]        
Concentration Risk, Percentage 13.00%      
Supplier three [Member] | Revenue Benchmark [Member] | Supplier Concentration Risk [Member]        
Concentration Risk [Line Items]        
Concentration Risk, Percentage   11.00%