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Note 13 - Acquisition of Klondex Mines Ltd. (Details Textual) |  |  |  | 25 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
May 01, 2018 USD ($) shares | Mar. 19, 2018 USD ($) $ / shares | Mar. 16, 2018 USD ($) $ / shares shares | Mar. 31, 2018 USD ($) shares | May 08, 2018 $ / shares shares | Dec. 31, 2017 shares
Common Stock, Shares, Issued, Total | shares |  |  |  | 400,301,617 |  | 399,176,425
Stock Issued During Period, Value, New Issues | $ |  |  |  | $ 17,700,000 |  |
Sixty Day Volumn-weighted Average Share Price | $ / shares |  | $ 3.94 |  |  |  |
Common Stock, Shares, Outstanding, Ending Balance | shares |  |  |  | 400,301,617 |  | 399,176,425
Subsequent Event [Member] |  |  |  |  |  |
Share Price | $ / shares |  |  |  |  | $ 3.97 |
Klondex Mines Ltd [Member] | Subsequent Event [Member] |  |  |  |  |  |
Common Stock, Shares, Issued, Total | shares | 179,668,072 |  |  |  | 187,144,996 |
Stock Issued During Period, Value, New Issues | $ | $ 7,476,924 |  |  |  |  |
Common Stock, Shares, Outstanding, Ending Balance | shares | 179,668,072 |  |  |  | 187,144,996 |
Klondex Mines Ltd [Member] |  |  |  |  |  |
Business Acquisition, Share Price | $ / shares |  |  | $ 2.47 |  |  |
Business Combination, Consideration, Cash Alternative, Price Per Share | $ / shares |  |  | $ 2.47 |  |  |
Business Combination, Consideration, Share Alternative, Share Exchange Rate |  |  | 0.6272 |  |  |
Business Combination Consideration, Combined Alternative, Price Per Share | $ / shares |  |  | $ 0.8411 |  |  |
Business Combination Consideration, Combined Alternative, Share Exchange Rate |  |  | 0.4136 |  |  |
Business Combination, Conditional Consideration, Cash Per Share to Acquiree's Shareholder | $ / shares |  |  | $ 0.8411 |  |  |
Business Combination, Conditional Consideration, Share to Acquiree's Shareholder, Per Share Base |  |  | 0.4136 |  |  |
Business Combination, Consideration Transferred, Total | $ |  | $ 462,300,000 |  |  |  |
Business Combination, Change in Total Consideration Transferred Per 10% Change in Share Price | $ |  | $ 30,500,000 |  |  |  |
Business Combination, Approval, Percentage of Votes |  | 66.67% |  |  |  |
Business Combination, Subscrition of New Formed Company, Value | $ |  | $ 7,000,000 |  |  |  |
Klondex Mines Ltd [Member] | Maximum [Member] |  |  |  |  |  |
Payments to Acquire Businesses, Gross | $ |  |  | $ 157,400,000 |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares |  |  | 77,411,859 |  |  |

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