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Note 4 - Stock-Based Compensation (Details Textual)
3 Months Ended
Jun. 30, 2015
$ / shares
shares
Time Vesting Restricted Stock Units [Member] | Minimum [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years
Time Vesting Restricted Stock Units [Member] | Maximum [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 4 years
Time Vesting Restricted Stock Units [Member] | Non-employee Directors [Member] | Vest in Full on the Earlier of the Day Prior to the Next Annual Meeting of Stockholders Following the Grant Date or The First Anniversary of The Grant Date [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted | shares 102,218
Time Vesting Restricted Stock Units [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted | shares 1,053,937
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 9
Employee Stock Option [Member] | Executive Officer [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 10 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 3.91
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate 1.57%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term 5 years 80 days
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate 47.30%
Performance Based Restricted Stock Units [Member] | Minimum [Member] | Executive Officer [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Payout, Percentage of Target 0.00%
Performance Based Restricted Stock Units [Member] | Maximum [Member] | Executive Officer [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Payout, Percentage of Target 150.00%
Performance Based Restricted Stock Units [Member] | Executive Officer [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted | shares 136,882
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 10.06
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate 1.02%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate 38.40%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Share Price, 30-Calendar Days Average Closing Price $ 8.96
Executive Officer [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | shares 695,698
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price $ 9