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Note 8 - Stock Based Compensation (Details Textual) - USD ($) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares) |  | 13,000 | 15,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  | 0 | 0 |
Share Price (in dollars per share) |  | $ 20.16 |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  | $ 1,300,000 |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  | 4 years |  |
Restricted Stock [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares) |  | 176,326 | 89,449 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  | 112,255 | 110,639 |
Share Purchase Match Program [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Matching Percentage of Common Stock Purchased | 20.00% |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Matching of Common Stock Purchased per Individual Within a Calendar Year | $ 25,000 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period (in shares) |  | 5,075 | 20,000 |
Shares Granted, Value, Share-based Payment Arrangement, before Forfeiture |  | $ 77,000 | $ 118,000 |
Share Purchase Match Program [Member] | Restricted Stock [Member] | An Employee [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period (in shares) |  |  | 1,742 |
Stock Issued During Period, Value, Issued for Services |  |  | $ 12,000 |
Share Purchase Match Program [Member] | Restricted Stock [Member] | Certain Key Employees [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period (in shares) |  | 111 |  |
Stock Issued During Period, Value, Issued for Services |  | $ 1,100 |  |
The 2019 Plan [Member] | Share-based Payment Arrangement, Option [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) |  |  |  | 1,500,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Pursuant to Exercise of Incentive Stock Options (in shares) |  |  |  | 1,000,000
The 2019 Plan [Member] | Share-based Payment Arrangement, Option [Member] | Employee or Consultant [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) |  |  |  | 250,000
The 2019 Plan [Member] | Share-based Payment Arrangement, Option [Member] | Non-employee Director [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) |  |  |  | 50,000
The 2019 Plan [Member] | Restricted Stock [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period (in shares) |  | 4,964 | 20,075 |
The 2019 Plan [Member] | Restricted Stock [Member] | Board of Directors [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period (in shares) |  | 51,155 | 81,943 |
Stock Issued During Period, Value, Issued for Services |  | $ 1,000,000.0 | $ 539,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares) |  | 46,191 | 61,868 |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  | 3 years | 3 months |
The 2019 Plan [Member] | Restricted Stock [Member] | An Employee [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period (in shares) |  | 60,000 | 25,000 |
Stock Issued During Period, Value, Issued for Services |  | $ 1,100,000 | $ 179,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  | 4 years | 4 years |
The 2019 Plan [Member] | Restricted Stock [Member] | An Employee [Member] | Share-based Payment Arrangement, Tranche One [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  | 50.00% | 50.00% |
The 2019 Plan [Member] | Restricted Stock [Member] | An Employee [Member] | Share-based Payment Arrangement, Tranche Two [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  | 6.25% | 6.25% |

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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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