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% |
X | ||||||||||
- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
X | ||||||||||
- Details
|
X | ||||||||||
- Details
|
X | ||||||||||
- Details
|
X | ||||||||||
- Details
|
X | ||||||||||
- Details
|