Annual report pursuant to Section 13 and 15(d)

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

v3.20.4
Note 2 - Summary of Significant Accounting Policies - Concentration of Credit Risk (Details)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Cost of Goods and Service Benchmark [Member] | Supplier Concentration Risk [Member] | Lead Acid Batteries [Member] | Supplier A [Member]    
Concentration risk 0.00% 69.00%
Cost of Goods and Service Benchmark [Member] | Supplier Concentration Risk [Member] | Lead Acid Batteries [Member] | Supplier B [Member]    
Concentration risk 0.00% 30.00%
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Clarios [Member]    
Concentration risk 16.00% 69.00%
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | P. Kay Metals [Member]    
Concentration risk 84.00% 28.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Clarios [Member]    
Concentration risk 0.00% 100.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | P. Kay Metals [Member]    
Concentration risk 0.00% 0.00%