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Note 11 - Common Shares (Details) - Share Repurchases - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Common stock repurchased on the open market or through tender offer |  |  |  |
Number of shares |  | 1,062,456 | 79,392 | 1,064,299
Aggregate market value of shares (in thousands) |  | $ 23,616,286 | $ 1,181,858 | $ 6,537,616
Average price per share |  | $ 22.23 | $ 14.89 | $ 6.14
Common stock received in connection with share-based compensation |  |  |  |
Number of shares | 99,675 | 99,675 |  |
Aggregate market value of shares (in thousands) |  | $ 2,335,000 |  |
Average price per share |  | $ 23.42 |  |

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- Definition Per share price of shares that received in connection with share-based compensation. + References No definition available. + Details
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- Definition The aggregate market value of shares that received in connection with share-based compensation. + References No definition available. + Details
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- Definition Per share or per unit amount of shares that have been repurchased and retired during the period. + References No definition available. + Details
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- Definition For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer. + References No definition available. + Details
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- Definition Number of shares that have been repurchased and retired during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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- Definition Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
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