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Note 8 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 28, 2021 | Dec. 31, 2022 | Dec. 31, 2022 | Mar. 31, 2022
The FY20 PSUs [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Vested, Percentage of Finance Performance Target |  |  |  |  | 126.00% |  |
The FY23 PSUs Member | Eligible Employees [Member] |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares) |  |  | 19,000 |  | 19,000 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares) |  |  |  |  | 13,000 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value (in dollars per share) |  |  |  |  | $ 185.57 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares) |  |  | 6,000 |  | 6,000 |  |
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) |  |  | $ 166.21 |  | $ 166.21 |  |
The FY23 PSUs Member | Eligible Employees [Member] | Minimum [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award Number of Shares Issued Upon Vesting, Percentage |  |  |  |  | 0.00% |  |
The FY23 PSUs Member | Eligible Employees [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, Vested in Period (in shares) |  |  |  |  | 10 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested 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, Nonvested, Number, Ending Balance (in shares) | [1] |  | 66 | [2] | 66 | [2] | 55
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] |  | $ 267.97 |  | $ 267.97 |  | $ 288.45
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | [1] |  |  |  | 19 |  |
Sharebased Payment Arrangement, Expected to Vest Share, Release of Cumulative Value |  |  | $ 1,427 |  |  |  |
Sharebased Payment Arrangement, Expected to Vest Share, Release of Cumulative Value, Net of Tax |  |  | $ 1,127 |  |  |  |
Sharebased Payment Arrangement, Expected to Vest Share, Release of Cumulative Value, Per Share, Basic (in dollars per share) |  |  | $ 0.21 |  | $ 0.21 |  |
Share-Based Payment Arrangement, Non-cash Expense, Expected Decrease Amount Per Quarter |  |  | $ 392 |  |  |  |
Sharebased Payment Arrangement, Expected to Vest Share, Release of Cumulative Value, Per Share, Diluted (in dollars per share) |  |  | $ 0.21 |  | $ 0.21 |  |
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
Performance Stock Units [Member] | Chief Executive Officer and Board Director [Member] |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Granted (in shares) |  | 40,000 |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Expected to Vest, Percentage |  |  |  |  | 93.00% |  |
The 2021 Equity Plan [Member] |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares) |  |  | 330,000 |  | 330,000 |  |
[1] | Balances for PSUs are reflected at target.
[2] | During the nine months ended December 31, 2022, the fiscal year 2020 PSUs vested and were distributed at 126% of target, based on actual performance results and completion of service conditions.

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