Quarterly report pursuant to Section 13 or 15(d)

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

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Note 2 - Summary of Significant Accounting Policies - Concentration of Credit Risk (Details)
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Clarios [Member]    
Concentration risk 0.00% 100.00%