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Note 4 - Employee Stock Benefit Plans (Details Textual)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2018
USD ($)
$ / shares
shares
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, Exercises in Period 19,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance 453,226
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance | $ / shares $ 10.18
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value | $ $ 5.7
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 4 years 73 days
Employee Stock Option [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 10 years
Restricted Stock Units (RSUs) [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 250,342
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period 409,215
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance 812,639
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding | $ $ 18.5
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms 1 year 255 days
Performance Shares [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 88,418
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period 39,174
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance 343,771
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding | $ $ 7.8
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms 1 year 292 days
Equity Based Performance Stock Units Granted in 2018, 2017, and 2016 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years
Equity Based Performance Stock Units Granted in 2018, 2017, and 2016 [Member] | Vest on the Third Anniversary of Awards Grant [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 100.00%
Equity-based Performance Stock Units Granted in 2015 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award, Performance Criteria Period 2 years
Equity-based Performance Stock Units Granted in 2015 [Member] | Vest on the Second and Third Anniversary of Awards Grant [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 50.00%
Minimum [Member] | Employee Stock Option [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 1 year
Minimum [Member] | Performance Shares [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Shares Available for Issue 25.00%
Maximum [Member] | Employee Stock Option [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 4 years
Maximum [Member] | Performance Shares [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Shares Available for Issue 200.00%
Equity Incentive Plan 2005 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 1,215,372
Equity Incentive Plan 2005 [Member] | Minimum [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 1 year
Equity Incentive Plan 2005 [Member] | Maximum [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 4 years
Employee Stock Purchase Plan [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 601,340
Percentage of Fair Value to Determine Price of Common Stock 85.00%
Stock Issued During Period, Shares, Employee Stock Purchase Plans 0