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Note 7 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands |  |  | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jun. 19, 2020 | Jun. 19, 2020 | Jun. 12, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Mar. 31, 2022 | Mar. 31, 2020
Share-based Payment Arrangement, Expense |  |  |  | $ 2,197 | $ 1,268 |  |  |
Proceeds from Issuance of Common Stock |  |  |  | $ 0 | $ 145,935 |  |  |
Public Offering [Member] |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  | 600 |  |  |  |  |
Shares Issued, Price Per Share (in dollars per share) | $ 225.00 | $ 225.00 | $ 225.00 |  |  |  |  |
Proceeds from Issuance of Common Stock |  | $ 145,935 |  |  |  |  |  |
Over-Allotment Option [Member] |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | 90 |  |  |  |  |  |  |
The FY19 PSUs [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Vested, Percentage of Finance Performance Target |  |  |  | 280.00% |  |  |  |
GPT PSUs [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Vested, Percentage of Finance Performance Target |  |  |  | 60.00% |  |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  |  | 0 |  |  |  |
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) |  |  |  | $ 0 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares) |  |  |  | 14 |  |  |  |
Restricted Stock Units (RSUs) [Member] | Chief Executive Officer [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares) |  |  |  |  |  | 3 |  |
Share-based Payment Arrangement, Expense |  |  |  | $ 351 |  |  |  |
Restricted Stock Units (RSUs) [Member] | Share-based Payment Arrangement, Tranche One [Member] | Chief Executive Officer [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares) |  |  |  | 1 |  |  |  |
Restricted Stock Units (RSUs) [Member] | Share-based Payment Arrangement, Tranche Two [Member] | Chief Executive Officer [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares) |  |  |  | 1 |  |  |  |
Restricted Stock Units (RSUs) [Member] | Share-based Payment Arrangement, Tranche Three [Member] | Chief Executive Officer [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares) |  |  |  | 1 |  |  |  |
Restricted Stock Units (RSUs) [Member] | Share-based Payment Arrangement, Nonemployee [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  |  | 1 year |  |  |  |
Restricted Stock Units (RSUs) [Member] | Share-based Payment Arrangement, Nonemployee [Member] | Share-based Payment Arrangement, Tranche Two [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  |  | 4 years |  |  |  |
Restricted Stock Units (RSUs) [Member] | Share-based Payment Arrangement, Employee [Member] | Share-based Payment Arrangement, Tranche One [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  |  | 3 years |  |  |  |
Restricted Stock Units (RSUs) [Member] | Share-based Payment Arrangement, Employee [Member] | Share-based Payment Arrangement, Tranche Three [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  |  | 5 years |  |  |  |
The FY20 PSUs [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  |  |  |  |  |  | 3 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  |  |  |  |  |  | 8
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) |  |  |  |  |  |  |  | $ 202.00
The FY20 PSUs [Member] | Forecast [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares) |  |  |  |  |  |  | 6 |
The FY20 PSUs [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award Number of Shares Issued Upon Vesting, Percentage |  |  |  | 0.00% |  |  |  |
The FY20 PSUs [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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