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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		12 Months Ended
	Jun. 19, 2020	Jun. 19, 2020	Jun. 12, 2020	Sep. 30, 2021	Jun. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Mar. 31, 2020
Share-based Payment Arrangement, Expense				$ 2,039		$ 2,008	$ 4,236	$ 3,276
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)							29
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)							$ 267.09
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)							19
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] | Chief Executive Officer [Member] | Share-based Payment Arrangement, Tranche One [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
The FY20 PSUs [Member]
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
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%
The 2021 Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)				330			330

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