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Note 13 - Acquisitions (Details Textual) CAD / shares in Units, $ / shares in Units, CAD in Millions | Aug. 02, 2016 USD ($) $ / shares | Jun. 27, 2016 CAD CAD / shares shares | May 31, 2016 USD ($) | Jun. 30, 2016 USD ($) | May 23, 2016 $ / shares shares | May 20, 2016 $ / shares
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Mines Management [Member] | Montanore Project [Member] |  |  |  |  |  |
Ownership Percentage |  |  |  |  | 100.00% |
Dolly Varden [Member] | Dolly Varden Historic Silver Property [Member] |  |  |  |  |  |
Ownership Percentage |  | 100.00% |  |  |  |
Mines Management [Member] | Subsequent Event [Member] |  |  |  |  |  |
Business Combination, Consideration Transferred | $ 59,100,000 |  |  |  |  |
Business Combination, Consideration Transferred, Impact of Ten Percent Change in Acquirer's Share Price | 5,900,000 |  |  |  |  |
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable | $ 9,030,010 |  |  |  |  |
Mines Management [Member] |  |  |  |  |  |
Business Acquistion, Number of Common Stock Shares Exchanged for Each Share of Acquiree Common Stock | shares |  |  |  |  | 0.2218 |
Business Acquisition, Estimated Value | $ / shares |  |  |  |  | $ 0.94 |
Dolly Varden [Member] |  |  |  |  |  |
Business Combination, Consideration Transferred | CAD |  | CAD 13.6 |  |  |  |
Business Acquisition, Share Price | CAD / shares |  | CAD 0.69 |  |  |  |
Business Combination, Step Acquisition, Equity Interest in Acquiree, Shares | shares |  | 2,620,291 |  |  |  |
Business Combination, Step Acquisition, Equity Interest in Acquiree, Warrants | shares |  | 1,250,000 |  |  |  |
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage |  | 19.80% |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |
Share Price | $ / shares | $ 6.55 |  |  |  |  |
Mines Management [Member] | Maximum [Member] |  |  |  |  |  |
Payments to Acquire Notes Receivable |  |  | $ 2,300,000 |  |  |
Mines Management [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |
Notes Receivable, Basis Spread on Variable Rate |  |  | 5.00% |  |  |
Mines Management [Member] |  |  |  |  |  |
Number of Secured Loans, Minimum |  |  | 1 |  |  |
Financing Receivable, Net |  |  |  | $ 1,400,000 |  |
Share Price | $ / shares | $ 0 |  |  |  |  | $ 4.24

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