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Note 9 - Stock-Based Compensation (Details) | 1 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2015 shares | Feb. 28, 2015 shares | May. 31, 2011 USD ($) shares | Sep. 30, 2015 USD ($) shares | Sep. 30, 2014 USD ($) shares | Dec. 31, 2014 shares | Dec. 31, 2013 shares
Note 9 - Stock-Based Compensation (Details) [Line Items] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares) |  |  |  | 0 | 21,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value | $ |  |  |  | $ 10,600,000 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value | $ |  |  |  | 8,500,000 | $ 1,100,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value | $ |  |  |  | 87,000 | 125,000 |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options | $ |  |  |  | $ 69,000 |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition |  |  |  | 2 years 248 days |  |  |
Allocated Share-based Compensation Expense | $ |  |  |  | $ 3,660,000 | 2,948,000 |  |
Virginia Heritage Plans [Member] |  |  |  |  |  |  |
Note 9 - Stock-Based Compensation (Details) [Line Items] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares) |  |  |  | 0 |  |  |
The 1998 Stock Option Plan [Member] |  |  |  |  |  |  |
Note 9 - Stock-Based Compensation (Details) [Line Items] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares) |  |  |  | 0 |  |  |
The Fidelity Plans [Member] |  |  |  |  |  |  |
Note 9 - Stock-Based Compensation (Details) [Line Items] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares) |  |  |  | 0 |  |  |
2006 Stock Plan [Member] |  |  |  |  |  |  |
Note 9 - Stock-Based Compensation (Details) [Line Items] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares) |  |  |  | 1,996,500 |  |  |
The 2011 ESPP [Member] |  |  |  |  |  |  |
Note 9 - Stock-Based Compensation (Details) [Line Items] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares) |  |  |  | 437,727 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in Shares) |  |  | 550,000 |  |  |  |
Employee Stock Purchase Plan, Percentage of Market Value |  |  | 85.00% |  |  |  |
Salaries and Employee Benefits [Member] |  |  |  |  |  |  |
Note 9 - Stock-Based Compensation (Details) [Line Items] |  |  |  |  |  |  |
Allocated Share-based Compensation Expense | $ |  |  |  | $ 3,700,000 | $ 2,900,000 |  |
Performance Shares [Member] |  |  |  |  |  |  |
Note 9 - Stock-Based Compensation (Details) [Line Items] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number (in Shares) |  |  |  | 0 |  |  |
Restricted Stock [Member] |  |  |  |  |  |  |
Note 9 - Stock-Based Compensation (Details) [Line Items] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in Shares) | 700 | 77,370 |  | 78,070 | 78,947 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Vesting Periods | 5 | 3 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number (in Shares) |  |  |  | 387,753 | 507,774 | 509,336 | 614,580
Restricted Stock [Member] | 2006 Stock Plan [Member] |  |  |  |  |  |  |
Note 9 - Stock-Based Compensation (Details) [Line Items] |  |  |  |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition |  |  |  | 1 year 240 days |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number (in Shares) |  |  |  | 387,753 |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options | $ |  |  |  | $ 6,600,000 |  |  |
Minimum [Member] | The 2011 ESPP [Member] |  |  |  |  |  |  |
Note 9 - Stock-Based Compensation (Details) [Line Items] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period |  |  | 1 year |  |  |  |
Minimum [Member] | Pay Period [Member] | The 2011 ESPP [Member] |  |  |  |  |  |  |
Note 9 - Stock-Based Compensation (Details) [Line Items] |  |  |  |  |  |  |
Amount Contributed To ESPP | $ |  |  | $ 10 |  |  |  |
Minimum Hours Per Week [Member] | The 2011 ESPP [Member] |  |  |  |  |  |  |
Note 9 - Stock-Based Compensation (Details) [Line Items] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period |  |  | 20 hours |  |  |  |
Minimum Months Per Year [Member] | The 2011 ESPP [Member] |  |  |  |  |  |  |
Note 9 - Stock-Based Compensation (Details) [Line Items] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period |  |  | 5 months |  |  |  |
Maximum [Member] | The 2011 ESPP [Member] |  |  |  |  |  |  |
Note 9 - Stock-Based Compensation (Details) [Line Items] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Subscription Rate |  |  | 10.00% |  |  |  |
Maximum [Member] | Offering Period [Member] | The 2011 ESPP [Member] |  |  |  |  |  |  |
Note 9 - Stock-Based Compensation (Details) [Line Items] |  |  |  |  |  |  |
Amount Contributed To ESPP | $ |  |  | $ 6,250 |  |  |  |
Maximum [Member] | Annually [Member] | The 2011 ESPP [Member] |  |  |  |  |  |  |
Note 9 - Stock-Based Compensation (Details) [Line Items] |  |  |  |  |  |  |
Amount Contributed To ESPP | $ |  |  | $ 25,000 |  |  |  |

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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 S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: 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 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 number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + 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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