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Note 10 - Common Shares (Details Textual) - USD ($) |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jan. 07, 2015 | Dec. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Feb. 09, 2016 | Feb. 11, 2015
Common Stock, Shares Authorized |  | 250,000,000 | 250,000,000 | 250,000,000 | 250,000,000 |  |  |
Common Stock, Shares, Outstanding | 11,135,825 | 10,685,599 | 10,461,574 | 10,685,599 | 10,685,599 |  |  |
Stock Repurchased and Retired During Period, Shares |  |  | 308,416 |  | 1,062,456 | 79,392 |  |
Stock Repurchased and Retired During Period, Value |  |  | $ 7,180,257 |  | $ 23,616,286 | $ 1,181,857 |  |
Common Stock, Shares, Issued | 11,135,825 | 10,685,599 | 10,461,574 | 10,685,599 | 10,685,599 |  |  |
Stock Buyback Program 2016 [Member] |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  | $ 40,000,000 |
Stock Repurchased and Retired During Period, Shares |  |  | 308,416 |  |  |  |  |
Stock Repurchased and Retired During Period, Value |  |  | $ 7,200,000 |  |  |  |  |
Stock Buyback Program 2015 [Member] |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  |  | $ 20,000,000
Stock Repurchased and Retired During Period, Shares |  | 231,047 |  |  | 868,549 |  |  |
Stock Repurchased and Retired During Period, Value |  | $ 5,400,000 |  |  | $ 20,000,000 |  |  |
Tender Offer [Member] |  |  |  |  |  |  |  |
Stock Repurchased and Retired During Period, Shares | 193,907 |  |  |  |  |  |  |
Stock Repurchased and Retired During Period, Value | $ 3,600,000 |  |  |  |  |  |  |
Treasury Stock Acquired, Average Cost Per Share |  |  |  | $ 18.50 |  |  |  |
Stock Repurchased Transaction Costs | $ 100,000 |  |  |  |  |  |  |

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- Definition The maximum number of common shares permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + 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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: 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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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