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Note 7 - Capital Stock (Details) (USD $) | 12 Months Ended |  | 1 Months Ended |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2011 | Dec. 31, 2012 | Dec. 30, 2013 Tender Offer [Member] | Nov. 27, 2013 Tender Offer [Member] | Dec. 30, 2013 Tender Offer [Member] Minimum [Member] | Dec. 30, 2013 Tender Offer [Member] Maximum [Member] | Nov. 30, 2010 November 2010 [Member] | Dec. 31, 2011 September 2011 [Member] | Dec. 31, 2013 September 2011 [Member] | Sep. 30, 2011 September 2011 [Member]
Note 7 - Capital Stock (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common Stock, Shares Authorized | 40,000,000 |  | 40,000,000 |  |  |  |  |  |  |  |
Preferred Stock, Shares Authorized | 10,000,000 |  | 10,000,000 |  |  |  |  |  |  |  |
Common Stock, Shares, Issued | 11,391,464 |  | 11,384,207 |  |  |  |  |  |  |  |
Common Stock, Shares, Outstanding | 7,983,539 |  | 8,701,607 |  |  |  |  |  |  |  |
Preferred Stock, Shares Issued | 0 |  | 0 |  |  |  |  |  |  |  |
Preferred Stock, Shares Outstanding | 0 |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased |  |  |  |  | 600,000 |  |  | 500,000 |  |  | 500,000
Treasury Stock, Shares, Acquired |  |  |  | 675,000 |  |  |  | 500,000 | 224,000 | 50,325 |
Stock Repurchase Program, Additional Shares Authroized to be Repurchased, Percent of Outstanding Shares, Percent |  |  |  |  | 2.00% |  |  |  |  |  |
Stock Repurchase Program, Additional Shares Authorized to be Repurchased, Percent of Outstanding Shares, Amount |  |  |  |  | 173,000 |  |  |  |  |  |
Treasury Stock Acquired, Cost Per Share (in Dollars per share) |  |  |  | $ 20.50 |  | $ 19.00 | $ 21.00 |  |  |  |
Treasury Stock, Value, Acquired, Cost Method (in Dollars) | $ 14,452,000 | $ 8,112,000 |  | $ 13,900,000 |  |  |  |  |  |  |
Treasury Stock, Shares | 3,407,925 |  | 2,682,600 |  |  |  |  |  |  |  |
Treasury Stock, Value (in Dollars) | $ 51,691,000 |  | $ 37,239,000 |  |  |  |  |  |  |  |

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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 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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