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Note 8 - Investments (Details Textual) - USD ($) |  | 3 Months Ended
--- | --- | ---
Feb. 15, 2021 | Mar. 31, 2022
LiNiCo [Member] |  |
Series A Preferred Stock Purchase Agreement, Initial Sale of Stock (in shares) | 375,000 |
Series A Preferred Stock Purchase Agreement, Approximate Proceeds from Initial Sale of Stock | $ 1,500,000 |
Series A Preferred Stock Purchase Agreement, Approximate Proceeds from Aggregate Sale of Stock | $ 232,000 |
LiNiCo [Member] |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  | 12.00%
LiNiCo [Member] | Comstock Mining Inc. [Member] |  |
Ownership Percentage | 88.00% |
Series A Preferred Stock [Member] | LiNiCo [Member] |  |
Preferred Stock, Dividend Rate, Percentage | 8.00% |
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ 1,000 |
LiNiCo [Member] |  |
Stock Issued During Period, Shares, Equity Method Invesment (in shares) | 375,000 |
LiNiCo [Member] | Series A Warrant [Member] |  |
Investment Warrant, Term (Year) | 3 years |
Investment Warrant, Exercised During Period (in shares) |  | 500
LiNiCo [Member] | Series A Preferred Stock [Member] |  |
Shares Received in Exchange of Common Stock Issued (in shares) | 1,500 |
Value of Shares Received in Exchange of Common Stock Issued | $ 1,500,000 |
Investment Owned, Balance, Shares (in shares) |  | 2,000

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