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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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