Quarterly report pursuant to Section 13 or 15(d)

Note 2 - Summary of Significant Accounting Policies - Concentration of Credit Risk (Details)

v3.20.2
Note 2 - Summary of Significant Accounting Policies - Concentration of Credit Risk (Details) - Customer Concentration Risk [Member]
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Revenue Benchmark [Member] | Clarios [Member]        
Concentration risk 0.00% 80.00% 16.00% 71.00%
Revenue Benchmark [Member] | P. Kay Metals [Member]        
Concentration risk 100.00% 17.00% 84.00% 26.00%
Accounts Receivable [Member] | Clarios [Member]        
Concentration risk     0.00% 100.00%
Accounts Receivable [Member] | P. Kay Metals [Member]        
Concentration risk     0.00% 0.00%