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Note 2 - Cash, Investments, and Restricted Cash (Details) | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2014 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2015 CAD | Dec. 31, 2012 USD ($)
Note 2 - Cash, Investments, and Restricted Cash (Details) [Line Items] |  |  |  |  |  |
Cash, FDIC Insured Amount |  | $ 250,000 |  |  |  |
Cash CDIC Insured Amount (in Dollars) | CAD |  |  |  |  | CAD 100,000 |
Long-term Investments |  | 1,515,000 | $ 4,920,000 |  |  |
Available-for-sale Securities, Amortized Cost Basis |  | 4,000,000 | 7,300,000 |  |  |
Other than Temporary Impairment Losses, Investments |  | 2,500,000 | 2,400,000 |  |  |
Payments to Acquire Investments |  | 947,000 | 580,000 | $ 6,001,000 |  |
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax |  | (1,159,000) | (1,409,000) | $ (2,552,000) |  | $ 2,059,000
Restricted Investments |  | 1,000,000 | $ 900,000 |  |  |
Adjustment to Restricted Cash | $ (7,500,000) |  |  |  |  |
Typhoon Exploration Inc. [Member] |  |  |  |  |  |
Note 2 - Cash, Investments, and Restricted Cash (Details) [Line Items] |  |  |  |  |  |
Equity Method Investments |  | 1,000,000 |  |  |  |
Brixton Metals Corporation [Member] |  |  |  |  |  |
Note 2 - Cash, Investments, and Restricted Cash (Details) [Line Items] |  |  |  |  |  |
Investment Owned, at Fair Value |  | 300,000 |  |  |  |
Non-Current Investments Held Having Net Loss Position [Member] |  |  |  |  |  |
Note 2 - Cash, Investments, and Restricted Cash (Details) [Line Items] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax |  | (2,600,000) |  |  |  |
Non-Current Investments Held Having Net Gain Position [Member] |  |  |  |  |  |
Note 2 - Cash, Investments, and Restricted Cash (Details) [Line Items] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax |  | $ 5,000 |  |  |  |

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