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Concentration of credit risk (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
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 December 31,For the Six Months Ended December 31,
2020201920202019
Domestic$1,865 64.4 %$1,590 58.0 %$3,408 64.2 %$3,056 60.8 %
Foreign1,033 35.6 %1,150 42.0 %1,904 35.8 %1,972 39.2 %
Total$2,898 100.0 %$2,740 100.0 %$5,312 100.0 %$5,028 100.0 %
         
Concentration Risk, Supplier         two   one
Customer Concentration Risk [Member]              
Concentration Risk [Line Items]              
Concentration Risk, Percentage 0.18%     13.00% 19.00% 18.00%  
Customer Concentration Risk [Member] | Customer One [Member]              
Concentration Risk [Line Items]              
Concentration Risk, Customer         One One  
Geographic Concentration Risk [Member]              
Concentration Risk [Line Items]              
Concentration Risk, Percentage 100.00%     100.00% 100.00% 100.00%  
Revenues       $ 2,740,000   $ 5,028,000  
Revenue Benchmark [Member] | Geographic Concentration Risk [Member]              
Concentration Risk [Line Items]              
Revenues $ 2,898,000       $ 5,312,000    
Accounts Payable Benchmark [Member] | Supplier Concentration Risk [Member]              
Concentration Risk [Line Items]              
Concentration Risk, Supplier         two   three
Accounts Receivable Benchmark [Member]              
Concentration Risk [Line Items]              
Concentration Risk, Customer         one   one
Concentration Risk, Percentage     18.00%   14.00%    
Domestic [Member] | Geographic Concentration Risk [Member]              
Concentration Risk [Line Items]              
Concentration Risk, Percentage 64.40%     58.00% 64.20% 60.80%  
Revenues $ 1,865,000     $ 1,590,000 $ 3,408,000 $ 3,056,000  
International [Member] | Geographic Concentration Risk [Member]              
Concentration Risk [Line Items]              
Concentration Risk, Percentage 35.60%     42.00% 35.80% 39.20%  
Revenues $ 1,033,000     $ 1,150,000 $ 1,904,000 $ 1,972,000  
Supplier one [Member] | Supplier Concentration Risk [Member]              
Concentration Risk [Line Items]              
Concentration Risk, Percentage 41.00%     38.00% 38.00% 32.00%  
Supplier one [Member] | Accounts Payable Benchmark [Member] | Supplier Concentration Risk [Member]              
Concentration Risk [Line Items]              
Concentration Risk, Percentage         44.00%   38.00%
Supplier two [Member] [Member] | Supplier Concentration Risk [Member]              
Concentration Risk [Line Items]              
Concentration Risk, Percentage 12.00%            
Supplier two [Member] [Member] | Accounts Payable Benchmark [Member] | Supplier Concentration Risk [Member]              
Concentration Risk [Line Items]              
Concentration Risk, Percentage         13.00%    
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         13.00% 11.00%  
Supplier two [Member] | Accounts Payable Benchmark [Member] | Supplier Concentration Risk [Member]              
Concentration Risk [Line Items]              
Concentration Risk, Percentage             12.00%