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Note 7 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Aug. 12, 2019 | Dec. 31, 2019 | Jun. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Stock Issued During Period, Shares, New Issues | 431,250 |  |  |  |
Sale of Stock, Underwriter Options, Shares | 56,250 |  |  |  |
Shares Issued, Price Per Share | $ 210 |  |  |  |
Proceeds from Issuance of Common Stock | $ 84,995 |  |  | $ 84,995 |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  | 8 |  | 28,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value |  |  |  | $ 213.33 |
Performance Stock Units [Member] |  |  |  |  |
Share Based Compensation Effect on Earning per Share Basic |  |  |  | 0.38 |
Share Based Compensation Effect on Earning per Share Diluted |  |  |  | $ 0.35 |
Share-based Payment Arrangement, Expected Noncash Expense, Increased (Decrease) Per Quarter |  |  |  | $ 533 |
Performance Stock Units [Member] | General and Administrative Expense [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Cumulative Effect of Adjustment, Vested in Period |  |  |  | 2,066 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Cumulative Effect of Adjustment, Vested in Period, Net of Tax |  |  |  | $ 1,561 |
Performance Stock Units [Member] | GPT Acquisition [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Vest Requirement, Percentage of Finance Performance Target |  | 90.00% |  |  |
Performance Stock Units [Member] | GPT Acquisition [Member] | Key Employees [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  | 4 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value |  | $ 240.35 |  |  |
Performance Stock Units [Member] | GPT Acquisition [Member] | Key Employees [Member] | Minimum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award Number of Shares Issued Upon Vesting, Percentage |  | 0.00% |  |  |
Performance Stock Units [Member] | GPT Acquisition [Member] | Key Employees [Member] | Maximum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award Number of Shares Issued Upon Vesting, Percentage |  | 150.00% |  |  |
Performance Shares [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  |  | 8 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value |  |  | $ 202 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  | 3 years |  |
Performance Shares [Member] | Minimum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award Number of Shares Issued Upon Vesting, Percentage |  |  | 0.00% |  |
Performance Shares [Member] | Maximum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award Number of Shares Issued Upon Vesting, Percentage |  |  | 200.00% |  |

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