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Note 11 - Common Shares (Details) |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jan. 07, 2015 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) $ / shares shares | Sep. 30, 2015 USD ($) shares | Jun. 30, 2015 USD ($) shares | Mar. 31, 2015 USD ($) shares | Sep. 30, 2014 USD ($) shares | Mar. 31, 2014 USD ($) shares | Dec. 31, 2015 USD ($) shares | Dec. 31, 2014 USD ($) shares | Dec. 31, 2013 USD ($) shares | Feb. 11, 2015 USD ($) | Mar. 05, 2014 USD ($)
Note 11 - Common Shares (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Shares Authorized | shares |  | 250,000,000 |  |  |  |  |  | 250,000,000 | 250,000,000 |  |  |
Common Stock, Shares, Outstanding | shares | 11,135,825 | 10,685,599 |  |  |  |  |  | 10,685,599 | 11,329,732 |  |  |
Stockholders' Equity Note, Stock Split, Conversion Ratio |  |  |  |  |  |  |  | 4 |  |  |  |
Stock Repurchased and Retired During Period, Shares | shares |  |  |  |  |  |  |  | 1,062,456 | 79,392 | 1,064,299 |  |
Stock Repurchased and Retired During Period, Value (in Dollars) | $ |  |  |  |  |  |  |  | $ 23,616,286 | $ 1,181,858 | $ 6,537,616 |  |
Common Stock, Shares, Issued | shares | 11,135,825 | 10,685,599 |  |  |  |  |  | 10,685,599 | 11,329,732 |  |  |
Shares Paid for Tax Withholding for Share Based Compensation | shares |  | 99,675 |  |  |  |  |  | 99,675 |  |  |  |
Shares Paid for Tax Withholding for Share Based Compensation, Price per Share, Fair Value (in Dollars per share) | $ / shares |  | $ 23.43 |  |  |  |  |  |  |  |  |  |
Shares Paid for Tax Withholding for Share Based Compensation, Fair Value (in Dollars) | $ |  | $ 2,300,000 |  |  |  |  |  |  |  |  |  |
Dutch Auction Tender Offer [Member] |  |  |  |  |  |  |  |  |  |  |  |
Note 11 - Common Shares (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchased and Retired During Period, Shares | shares | 193,907 |  |  |  |  |  |  |  |  |  |  |
Treasury Stock Acquired, Average Cost Per Share (in Dollars per share) | $ / shares | $ 18.50 |  |  |  |  |  |  |  |  |  |  |
Stock Repurchased and Retired During Period, Value (in Dollars) | $ | $ 3,587,280 |  |  |  |  |  |  |  |  |  |  |
Stock Repurchased Transaction Costs (in Dollars) | $ | $ 70,000 |  |  |  |  |  |  |  |  |  |  |
Stock Buyback Program 2015 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Note 11 - Common Shares (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchased and Retired During Period, Shares | shares |  | 231,047 | 398,000 | 25,413 | 214,089 |  |  | 868,549 |  |  |  |
Stock Repurchased and Retired During Period, Value (in Dollars) | $ |  | $ 5,400,000 | $ 10,000,000 | $ 500,000 | $ 4,100,000 |  |  | $ 20,000,000 |  |  |  |
Stock Repurchase Program, Authorized Amount (in Dollars) | $ |  |  |  |  |  |  |  |  |  |  | $ 20,000,000 |
Stock Buyback Program 2014 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Note 11 - Common Shares (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchased and Retired During Period, Shares | shares |  |  |  |  |  | 73,300 | 6,092 |  | 79,392 |  |  |
Stock Repurchased and Retired During Period, Value (in Dollars) | $ |  |  |  |  |  | $ 1,100,000 | $ 82,286 |  | $ 1,200,000 |  |  |
Stock Repurchase Program, Authorized Amount (in Dollars) | $ |  |  |  |  |  |  |  |  |  |  |  | $ 20,000,000

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- Definition The fair value of shares that the employees use to repay the employer for net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations. + References No definition available. + Details
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- Definition The per share fair value of shares that the employees use to repay the employer for net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations. + References No definition available. + Details
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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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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