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Note 5 - Stock-Based Compensation (Details) (USD $) | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Apr. 30, 2013 | Mar. 31, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012 | Dec. 31, 2011
Note 5 - Stock-Based Compensation (Details) [Line Items] |  |  |  |  |  |  |  |  |
Maximum Period Of Common Stock Granted |  |  | 10 |  |  | 10 |  |  |
Annual Increments To Be Vested In Common Stock Units |  |  | 20.00% |  |  | 20.00% |  |  |
Stock or Unit Option Plan Expense |  |  | $ 0 |  | $ 194,000 |  |  |  |
Allocated Share-based Compensation Expense |  |  |  |  |  | 129,000 | 387,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in Shares) |  |  | 0 | 0 |  |  | 39,784 |  |
Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options |  |  |  |  |  |  | 647,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value |  |  |  |  |  |  | 34,000 |  |
(in Shares) | 6,729 | 14,416 |  |  |  |  |  | 125,133 | 147,661
GrantSharesAveragePriceDuringPeriodRestrictedStockUnitAward (in Dollars per share) | $ 18.91 | $ 20.57 |  |  |  |  |  | $ 18.24 | $ 14.78
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |
Note 5 - Stock-Based Compensation (Details) [Line Items] |  |  |  |  |  |  |  |  |
Stock or Unit Option Plan Expense |  |  | 492,000 |  | 409,000 |  |  |  |
Allocated Share-based Compensation Expense |  |  |  |  |  | 1,100,000 | 762,000 |  |
(in Shares) |  |  |  |  |  | 21,145 |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized |  |  | $ 2,000,000 |  |  | $ 2,000,000 |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition |  |  |  |  |  | 1 year 109 days |  |  |
2005 Incentive Plan [Member] |  |  |  |  |  |  |  |  |
Note 5 - Stock-Based Compensation (Details) [Line Items] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares) |  |  | 2,654,098 |  |  | 2,654,098 |  |  |
Restricted Stock Units Granted in 2011, 2012 and 2013 [Member] |  |  |  |  |  |  |  |  |
Note 5 - Stock-Based Compensation (Details) [Line Items] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  |  | 2 years |  |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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