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Note 10 - Share-based Compensation (Details Textual) $ / shares in Units, $ in Thousands |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 03, 2023 shares | Jan. 01, 2001 shares | Dec. 31, 2022 shares | Apr. 01, 2023 USD ($) $ / shares shares | Apr. 02, 2022 USD ($) shares | Dec. 31, 2022 shares | Jan. 01, 2022 shares | Jan. 02, 2021 shares | Dec. 29, 2018 shares | Dec. 31, 2016 shares | Dec. 27, 2015 shares | Mar. 31, 2023 $ / shares | Dec. 31, 2014 shares
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) |  |  |  | 10 years |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expense | $ |  |  |  | $ 496 | $ 403 |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $ |  |  |  | $ 3,700 |  |  |  |  |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance (in shares) |  |  | 1,754,852 | 1,534,350 |  | 1,754,852 |  |  |  |  |  |  |
Dividends Payable | $ |  |  |  | $ 0 |  |  |  |  |  |  |  |  |
Employee Stock Purchase Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expense | $ |  |  |  | $ 75 | $ 60 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Offering Date |  | 85.00% |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Subscription Rate |  | 10.00% |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Number of Shares Per Employee (in shares) |  | 3,000 |  |  |  |  |  |  |  |  |  |  |
Additional Shares of Common Stock Reserved for Future Issuance (in shares) |  |  |  |  |  |  | 400,000 |  | 300,000 |  | 300,000 |  |
Common Stock, Capital Shares Reserved for Future Issuance (in shares) |  |  |  |  |  |  | 1,800,000 |  | 1,400,000 |  | 1,100,000 |  |
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares) | 33,071 |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) |  |  |  | 331,160 |  |  |  |  |  |  |  |  |
The 2014 Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) |  |  |  | 632,094 |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) |  |  |  | 2,975,000 |  |  |  |  |  |  |  |  | 625,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in shares) |  |  |  |  |  | 1,000,000 |  | 850,000 |  | 500,000 |  |  |
Time-based Restricted Stock Units [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $ |  |  |  | $ 3,200 |  |  |  |  |  |  |  |  |
Share Price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 11.56 |
Time-based Restricted Stock Units [Member] | The 2014 Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $ |  |  |  | $ 3,200 |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number (in shares) |  |  | 274,939 | 471,096 |  | 274,939 |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Nonvested | $ |  |  |  | $ 5,400 |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  |  | 262,428 |  |  |  |  |  |  |  |  |
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) | $ / shares |  |  |  | $ 12.50 |  |  |  |  |  |  |  |  |
Performance-based Restricted Stock Units [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $ |  |  |  | $ 500 |  |  |  |  |  |  |  |  |
Performance-based Restricted Stock Units [Member] | Immediately Vested [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  |  | 4,762 | 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) | $ / shares |  |  |  | $ 10.50 |  |  |  |  |  |  |  |  |
Performance-based Restricted Stock Units [Member] | The 2014 Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expense | $ |  |  |  | $ 100 | $ 200 |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number (in shares) |  |  | 225,000 | 100,000 |  | 225,000 |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Granted (in shares) |  |  | 100,000 |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options, Maximum Shares Upon Adjustment (in shares) |  |  | 125,000 |  |  | 125,000 |  |  |  |  |  |  |
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) | $ / shares |  |  |  | $ 0 |  |  |  |  |  |  |  |  |
Performance-based Restricted Stock Units [Member] | The 2014 Plan [Member] | Chief Executive Officer [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Number of Outstanding Grant |  |  |  | 1 |  |  |  |  |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  |  | 1 year |  |  |  |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  |  | 5 years |  |  |  |  |  |  |  |  |

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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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