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Note 15 - Stock-based Compensation (Details Textual) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
May 09, 2019 | Dec. 31, 2021 | Dec. 31, 2020
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net, Total |  | $ 0 | $ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Amortization Period (Year) |  | 1 year 7 months 6 days | 1 year 7 months 6 days
Restricted Stock [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  | 49,988 | 61,373
Share-based Payment Arrangement, Expensed and Capitalized, Amount, Total |  | $ 1,700 | $ 600
Share-based Payment Arrangement, Expense |  | 1,200 | 800
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount |  | $ 900 |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  | 1 year 6 months |
Restricted Stock [Member] | Minimum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Month) |  | 12 months |
Restricted Stock [Member] | Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Month) |  | 60 months |
Share-based Payment Arrangement, Option [Member] |  |  |
Share-based Payment Arrangement, Expense |  | $ 2,000 | 500
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) |  | 10 years |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term (Year) |  | 5 years |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate |  | 80.90% |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate |  | 0.86% |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Fair Value |  | $ 3,100 | 1,400
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount |  | $ 2,400 | $ 1,400
The Fourth Amended 2014 Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in shares) | 2,000,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period Extension (Year) | 2 years |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) |  |  | 1,661,957
Employee Stock Purchase Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) |  | 54,321 |

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- Definition Period of extension for an equity-based award to expire, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Weighted average remaining amortization period for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount of increase (decrease) in additional paid in capital (APIC) resulting from a tax benefit (deficiency) associated with an share-based compensation plan other than an employee stock ownership plan (ESOP). + References No definition available. + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + 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 (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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