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Note 8- Stock-based Compensation (10 Q) (Details Textual) - USD ($) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 01, 2023 | Mar. 31, 2023 | Mar. 31, 2022 | Dec. 31, 2022 | Dec. 31, 2021
Statement [Line Items] |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested in Period, Fair Value |  | $ 100,000 | $ 200,000 | $ 800,000 | $ 800,000
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation |  |  | 274 | 685 |
Share-Based Payment Arrangement, Expense |  | 121,371 | $ 278,131 | $ 928,052 | 897,260
Share-Based Payment Arrangement, Option [Member] |  |  |  |  |
Statement [Line Items] |  |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount |  | $ 400,000 |  | $ 900,000 |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition |  | 1 year 3 months 7 days |  | 1 year 6 months |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |
Statement [Line Items] |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period |  | 18 months |  | 18 months |
Restricted Stock Units (RSUs) [Member] | Director [Member] |  |  |  |  |
Statement [Line Items] |  |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount |  | $ 48,000,000,000 |  | $ 100,000 |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition |  | 1 year 14 days |  | 1 year 3 months 18 days |
Share-Based Payment Arrangement, Expense |  | $ 14,000 | $ 16,000 | $ 65,000 | $ 54,000
Equity Incentive Plan 2015 [Member] |  |  |  |  |
Statement [Line Items] |  |  |  |  |
Percentage of Total Shares Eligible for Plan Reserve, On an Annual Basis |  | 4.00% |  | 4.00% |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized | 81,582 |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant |  | 141,096 |  |  |

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