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Concentration of credit risk (Details) - USD ($)
3 Months Ended 6 Months Ended 9 Months Ended
Mar. 31, 2023
Sep. 30, 2022
Mar. 31, 2022
Dec. 31, 2022
Mar. 31, 2023
Mar. 31, 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 March 31,For the Nine Months Ended March 31,
2023202220232022
Domestic$1,903 55 %$1,266 52 %$5,258 58 %$4,251 55 %
Foreign1,531 45 %1,150 48 %3,787 42 %3,541 45 %
Total$3,434 100 %$2,416 100 %$9,045 100 %$7,792 100 %
 
Revenues $ 3,434,314   $ 2,416,127   $ 9,044,619 $ 7,791,953
Customer Concentration Risk [Member] | Customer One [Member]            
Concentration Risk [Line Items]            
Concentration Risk, Customer     No   No One
Geographic Concentration Risk [Member]            
Concentration Risk [Line Items]            
Revenues           $ 7,792,000
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Customer One [Member]            
Concentration Risk [Line Items]            
Concentration Risk, Percentage     10.00%   10.00% 12.00%
Revenue Benchmark [Member] | Geographic Concentration Risk [Member]            
Concentration Risk [Line Items]            
Concentration Risk, Percentage 100.00%   100.00%   100.00% 100.00%
Revenues $ 3,434,000   $ 2,416,000   $ 9,045,000 $ 7,792,000
Accounts Payable Benchmark [Member] | Supplier Concentration Risk [Member]            
Concentration Risk [Line Items]            
Concentration Risk, Supplier   one     one  
Accounts Receivable Benchmark [Member]            
Concentration Risk [Line Items]            
Concentration Risk, Customer         one  
Accounts Receivable            
Concentration Risk [Line Items]            
Concentration Risk, Customer   one two   two two
Accounts Receivable | Customer Concentration Risk [Member] | Customer One [Member]            
Concentration Risk [Line Items]            
Concentration Risk, Percentage   13.00%     11.00%  
Domestic [Member] | Geographic Concentration Risk [Member]            
Concentration Risk [Line Items]            
Revenues           $ 4,251,000
Domestic [Member] | Revenue Benchmark [Member] | Geographic Concentration Risk [Member]            
Concentration Risk [Line Items]            
Concentration Risk, Percentage 55.00%   52.00%   58.00% 55.00%
Revenues $ 1,903,000   $ 1,266,000   $ 5,258,000 $ 4,251,000
International [Member] | Revenue Benchmark [Member] | Geographic Concentration Risk [Member]            
Concentration Risk [Line Items]            
Concentration Risk, Percentage 45.00%   48.00%   42.00% 45.00%
Revenues $ 1,531,000   $ 1,150,000   $ 3,787,000 $ 3,541,000
Supplier one [Member] | Revenue Benchmark [Member] | Supplier Concentration Risk [Member]            
Concentration Risk [Line Items]            
Concentration Risk, Percentage 44.00%   37.00%   44.00% 39.00%
Supplier one [Member] | Accounts Payable Benchmark [Member] | Supplier Concentration Risk [Member]            
Concentration Risk [Line Items]            
Concentration Risk, Percentage       36.00% 47.00%  
Supplier two [Member] | Revenue Benchmark [Member] | Supplier Concentration Risk [Member]            
Concentration Risk [Line Items]            
Concentration Risk, Percentage 11.00%   16.00%   10.00% 13.00%