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Note 7 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Thousands					3 Months Ended		9 Months Ended		12 Months Ended
		Oct. 28, 2021	Jun. 19, 2020	Jun. 12, 2020	Dec. 31, 2021	Jun. 30, 2021	Dec. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Sep. 30, 2021	Mar. 31, 2021
Proceeds from Issuance of Common Stock							$ 0	$ 145,935
Public Offering [Member]
Stock Issued During Period, Shares, New Issues (in shares)				600,000
Shares Issued, Price Per Share (in dollars per share)			$ 225.00
Proceeds from Issuance of Common Stock				$ 145,935
Over-Allotment Option [Member]
Stock Issued During Period, Shares, New Issues (in shares)			90,000
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)							37
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)							$ 274.83
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value, Ending Balance (in dollars per share)	[1]				$ 253.59		$ 253.59				$ 206.56
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)							20
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)						3,000
Share-based Compensation Expense, Cumulative True-up						$ 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)						1,000
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)									8,000
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, Expected to Vest (in shares)					9,000		9,000			6,000
Share-based Payment Arrangement, True Up of Vested Share Value					$ 584
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total					$ 151		$ 151
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%
Performance Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)							47
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)							$ 302.15
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value, Ending Balance (in dollars per share)	[1]				$ 288.45		$ 288.45				$ 207.88
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)							28
Performance Stock Units [Member] | Chief Executive Officer and Board Director [Member]
Share Based Compensation Arrangement By Share Based Payment Award, Non Option Equity Instruments, Performance Period Granted (Year)		3 years
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted (in shares)		40,000
Performance Stock Units [Member] | Employees of Agena [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)					7,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value, Ending Balance (in dollars per share)					$ 305.79		$ 305.79
Performance Stock Units [Member] | Minimum [Member] | Employees of Agena [Member]
Share-based Compensation Arrangement by Share-based Payment Award Number of Shares Issued Upon Vesting, Percentage					50.00%
Performance Stock Units [Member] | Maximum [Member] | Employees of Agena [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)										330,000
[1] Balances for performance-based restricted stock units ("PSUs") are reflected at target.

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