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Note 5 - Stock-based Compensation (Details) | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2015 shares | Dec. 31, 2014 shares | Mar. 31, 2016 USD ($) shares | Mar. 31, 2015 USD ($) shares | Dec. 31, 2015 $ / shares shares | Dec. 31, 2013 shares
Note 5 - Stock-based Compensation (Details) [Line Items] |  |  |  |  |  |
Maximum Period of Common Stock Granted |  |  | 10 years |  |  |
Annual Increments to Be Vested in Common Stock Units |  |  | 20.00% |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | shares |  |  | 0 | 0 |  |
Allocated Share-based Compensation Expense (in Dollars) |  |  | $ 0 | $ 0 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period | shares |  |  | 2,110 | 3,750 |  |
Proceeds from Stock Options Exercised (in Dollars) |  |  | $ 49,000 | $ 88,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value (in Dollars) |  |  | 9,000 | 10,000 |  |
Benefit (Shortfall) of Tax Deductions from Share-based Compensation (in Dollars) |  |  | (3,298,000) | (4,395,000) |  |
Additional Paid-in Capital [Member] |  |  |  |  |  |
Note 5 - Stock-based Compensation (Details) [Line Items] |  |  |  |  |  |
Benefit (Shortfall) of Tax Deductions from Share-based Compensation (in Dollars) |  |  | $ 140,000 |  |  |
2005 Incentive Plan [Member] |  |  |  |  |  |
Note 5 - Stock-based Compensation (Details) [Line Items] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | shares |  |  | 3,789,782 |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |
Note 5 - Stock-based Compensation (Details) [Line Items] |  |  |  |  |  |
Allocated Share-based Compensation Expense (in Dollars) |  |  | $ 1,000,000 | $ 1,100,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | shares |  |  | 0 |  | 37,675 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share) | $ / shares |  |  |  |  | $ 27.53 |
Number of Officers Receiving Award | 7 | 7 |  |  |  | 8
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized (in Dollars) |  |  | $ 6,500,000 |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition |  |  | 2 years 73 days |  |  |
Performance TSR Restricted Stock [Member] |  |  |  |  |  |
Note 5 - Stock-based Compensation (Details) [Line Items] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | shares | 61,209 | 60,456 |  |  |  | 119,840
Performance EPS Restricted Stock Units [Member] |  |  |  |  |  |
Note 5 - Stock-based Compensation (Details) [Line Items] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | shares | 57,409 | 57,642 |  |  |  | 116,186

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- Definition The expense resulting from the benefit (short-fall) of tax deductions from share-based compensation, in excess of grant-date fair value. + References No definition available. + Details
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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 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + 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 (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3255-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued 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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