Note 6 - Stock Subscriptions and Other Receivables and Concentrations of Credit Risk (Details Textual) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2020 |
Dec. 31, 2019 |
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| Accounts Receivable, Allowance for Credit Loss, Current | $ 0 | $ 0 |
| Customer Concentration Risk [Member] | Accounts and Other Receivables [Member] | An Investor [Member] | ||
| Concentration Risk, Percentage | 98.00% | 90.00% |
| X | ||||||||||
- Definition Amount of allowance for credit loss on accounts receivable, classified as current. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| 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
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| X | ||||||||||
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