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Note 13 - Stock-based Compensation (Details Textual) - USD ($) |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
May 29, 2014 | May 31, 2019 | Apr. 30, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Apr. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2019 | Mar. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  |  |  |  |  |  |  |  |  | 0 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance |  |  |  |  |  |  |  |  |  |  |  | 45,068 | 56,131
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value |  |  |  |  |  |  |  |  |  | $ 953,000 | $ 719,000 | $ 256,000 |
Share-based Payment Arrangement, Expense |  |  |  |  |  |  |  |  |  | 912,000 | 732,000 | 614,000 |
Share-based Payment Arrangement, Expense, Tax Benefit |  |  |  |  |  |  |  |  |  | $ 200,000 | $ 172,000 | $ 231,000 |
Allocated Share-based Compensation Expense, Impact on Earnings Per Share, Diluted |  |  |  |  |  |  |  |  |  | $ 0.12 | $ 0.09 |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  |  |  |  |  |  |  | $ 924,000 |  | $ 924,000 |  |  |
Allocated Share-based Compensation Expense, Impact on Earnings Per Share, Basic |  |  |  |  |  |  |  |  |  | $ 0.12 | 0.10 |  |
Allocated Share-based Compensation Expense, Impact on Earnings Per Share, Basic and Diluted |  |  |  |  |  |  |  |  |  |  |  | $ 0.26 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares, Ending Balance |  |  |  |  |  |  |  |  |  |  |  | 0 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value |  |  |  |  |  |  |  |  |  |  | $ 6.34 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value |  |  |  |  |  |  |  |  |  |  | $ 1,406,000 | $ 82,000 |
Proceeds from Stock Options Exercised |  |  |  |  |  |  |  |  |  | $ 0 | 485,000 | 123,000 |
Amortization, Current Year [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  |  |  |  |  |  |  | 399,000 |  | 399,000 |  |  |
Amortization Year 2 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  |  |  |  |  |  |  | 263,000 |  | 263,000 |  |  |
Amortization, Year 3 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  |  |  |  |  |  |  | $ 262,000 |  | $ 262,000 |  |  |
Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value |  |  |  |  |  |  |  |  |  | $ 48.75 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  |  |  |  |  |  |  |  |  | 2,058 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value |  |  |  |  |  |  |  |  |  | $ 36.35 |  |  |
Accrual Shares to Each Non-employee Director [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  |  |  |  |  |  | $ 100,000 | $ 70,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Grants in Period |  |  |  |  |  |  |  |  |  |  | 276 |  |
Accrual Shares to Each Non-employee Director [Member] | Nine Non-Employee Directors [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Grants in Period |  |  |  |  |  |  |  | 205 |  |  |  |  |
Accrual Shares to Each Non-employee Director [Member] | One Non-Employee Directors [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Grants in Period |  |  |  |  |  |  |  |  |  | 213 |  |  |
Nonqualified Options [Member] | Annual Grant to Non-employee [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  |  |  |  |  |  |  |  | $ 70,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Grants in Period |  |  |  |  |  |  |  |  | 614 |  |  |  |
The 2014 Stock Option Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | 750,000 |  |  |  |  |  |  |  |  |  |  |  |
Number of Common Stock Accrued Under Share-based Compensation Plan for Each Non-employee Director |  | 213 | 1,845 |  | 1,932 |  | 4,298 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  |  |  |  |  |  |  |  |  | 0 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance |  |  |  | 0 |  |  |  |  |  |  | 0 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant |  |  |  |  |  |  |  | 407,000 |  | 407,000 |  |  |
The 2014 Stock Option Plan [Member] | Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value |  |  |  | $ 36.35 |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  |  |  | 33,000 |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  | 4 years |  |  |  |  |  |  |  |  |
The 2014 Stock Option Plan [Member] | Restricted Stock [Member] | Chief Executive Officer [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value |  |  |  |  |  | $ 16.38 |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  |  |  |  |  | 100,000 |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  |  | 3 years |  |  |  |  |  |  |
The 2014 Stock Option Plan [Member] | Stock Award [Member] | Director [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value |  | $ 47.06 | $ 48.94 |  | $ 36.35 |  | $ 16.29 |  |  |  |  |  |
The 2014 Stock Option Plan [Member] | Minimum [Member] | Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent | 85.00% |  |  |  |  |  |  |  |  |  |  |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -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=116856206&loc=d3e5070-113901 + Details
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