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Concentration of credit risk (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Jun. 30, 2020
Concentration Risk [Line Items]          
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]     Domestic and international sales from continuing operations are as follows:
( in thousands)For the Three Months Ended March 31,For the Nine Months Ended March 31,
2021202020212020
Domestic$1,107 47.6 %$1,440 61.1 %$4,514 59.1 %$4,496 60.9 %
Foreign1,218 52.4 %917 38.9 %3,123 40.9 %2,889 39.1 %
Total$2,325 100.0 %$2,357 100.0 %$7,637 100.0 %$7,385 100.0 %
   
Concentration Risk, Supplier   two two    
Customer Concentration Risk [Member]          
Concentration Risk [Line Items]          
Concentration Risk, Percentage 10.00% 13.00%   15.00%  
Customer Concentration Risk [Member] | Customer One [Member]          
Concentration Risk [Line Items]          
Concentration Risk, Customer No One One One  
Geographic Concentration Risk [Member]          
Concentration Risk [Line Items]          
Concentration Risk, Percentage 100.00% 100.00% 100.00% 100.00%  
Revenues   $ 2,357,000   $ 7,385,000  
Revenue Benchmark [Member] | Geographic Concentration Risk [Member]          
Concentration Risk [Line Items]          
Revenues $ 2,325,000   $ 7,637,000    
Accounts Payable Benchmark [Member] | Supplier Concentration Risk [Member]          
Concentration Risk [Line Items]          
Concentration Risk, Supplier     one   three
Accounts Receivable Benchmark [Member]          
Concentration Risk [Line Items]          
Concentration Risk, Customer     no   one
Concentration Risk, Percentage     10.00%   18.00%
Domestic [Member] | Geographic Concentration Risk [Member]          
Concentration Risk [Line Items]          
Concentration Risk, Percentage 47.60% 61.10% 59.10% 60.90%  
Revenues $ 1,107,000 $ 1,440,000 $ 4,514,000 $ 4,496,000  
International [Member] | Geographic Concentration Risk [Member]          
Concentration Risk [Line Items]          
Concentration Risk, Percentage 52.40% 38.90% 40.90% 39.10%  
Revenues $ 1,218,000 $ 917,000 $ 3,123,000 $ 2,889,000  
Supplier one [Member] | Supplier Concentration Risk [Member]          
Concentration Risk [Line Items]          
Concentration Risk, Percentage 45.00% 38.00% 40.00% 34.00%  
Supplier one [Member] | Accounts Payable Benchmark [Member] | Supplier Concentration Risk [Member]          
Concentration Risk [Line Items]          
Concentration Risk, Percentage     43.00%   38.00%
Supplier three [Member] | Accounts Payable Benchmark [Member] | Supplier Concentration Risk [Member]          
Concentration Risk [Line Items]          
Concentration Risk, Percentage         11.00%
Supplier two [Member] | Supplier Concentration Risk [Member]          
Concentration Risk [Line Items]          
Concentration Risk, Percentage 17.00%   14.00% 13.00%  
Supplier two [Member] | Accounts Payable Benchmark [Member] | Supplier Concentration Risk [Member]          
Concentration Risk [Line Items]          
Concentration Risk, Percentage         12.00%