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Note 8 - Stockholders' Equity (Details Textual) |  | 1 Months Ended | 3 Months Ended | 13 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
May 04, 2017 USD ($) $ / shares | Mar. 31, 2017 USD ($) $ / shares $ / oz shares | Mar. 31, 2017 USD ($) $ / shares $ / oz shares | Mar. 31, 2016 USD ($) $ / shares shares | Mar. 31, 2017 USD ($) $ / shares $ / oz shares | Feb. 23, 2016 USD ($) | May 08, 2012 shares
Shares Paid for Tax Withholding for Share Based Compensation | shares |  |  | 154,933 | 532,157 |  |  |
Payments Related to Tax Withholding for Share-based Compensation |  |  | $ 700,000 | $ 1,300,000 |  |  |
Treasury Stock Acquired, Average Cost Per Share | $ / shares |  |  | $ 4.67 | $ 2.36 |  |  |
Average Realized Silver Price |  |  | $ 17.90 |  |  |  |
Average Realized Silver Price Minimum Dividend Threshold | $ / oz |  | 30 | 30 |  | 30 |  |
Stock Issued During Period, Shares, New Issues | shares |  |  |  |  | 2,780,087 |  |
Stock Issued During Period, Value, New Issues |  |  |  |  | $ 8,100,000 |  |
Payments for Brokerage Fees |  |  |  |  | $ 166,000 |  |
Common Stock Repurchase Program [Member] |  |  |  |  |  |  |
Treasury Stock Acquired, Average Cost Per Share | $ / shares |  |  | $ 3.99 |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased | shares |  |  |  |  |  |  | 20,000,000
Cumulative Stock Repurchased | shares |  | 934,100 | 934,100 |  | 934,100 |  |
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased | shares |  | 19,100,000 | 19,100,000 |  | 19,100,000 |  |
Subsequent Event [Member] |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared | $ / shares | $ 0.0025 |  |  |  |  |  |
Dividends, Common Stock | $ 1,000,000 |  |  |  |  |  |
Subsequent Event [Member] | Common Stock Repurchase Program [Member] |  |  |  |  |  |  |
Share Price | $ / shares |  | $ 5.14 | $ 5.14 |  | $ 5.14 |  |
Minimum [Member] |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared | $ / shares |  |  | $ 0.01 |  |  |  |
Maximum [Member] |  |  |  |  |  |  |
Common Stock, Aggregate Offering Price |  |  |  |  |  | $ 75,000,000 |
Employees and Non-employee Directors [Member] |  |  |  |  |  |  |
Allocated Share-based Compensation Expense |  |  | $ 1,300,000 | $ 1,200,000 |  |  |
Stock Awards [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period | shares |  | 641,406 |  |  |  |  |
Allocated Share-based Compensation Expense |  | $ 4,200,000 |  |  |  |  |

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