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Note 10 - Share-based Compensation (Details Textual) - USD ($) |  |  | 12 Months Ended
--- | --- | --- | ---
Jan. 01, 2021 | Jan. 29, 2020 | Dec. 31, 2021 | Dec. 31, 2020
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share) |  | $ 5.32 | $ 3.56 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) |  | 515,036 | 772,435 |
Share-based Payment Arrangement, Expensed and Capitalized, Amount, Total |  | $ 569,000 |  |
Share-based Payment Arrangement, Expense |  | 412,000 | $ 1,661,000 | $ 2,952,000
Share-based Payment Arrangement, Amount Capitalized |  | $ 157,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Remaining Weighted Average Award Vesting Period (Year) |  | 3 years |  |
Share Price (in dollars per share) |  |  | $ 1.94 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value |  |  | $ 3,000 | $ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) |  |  | $ 3.10 | $ 1.73
Employees [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) |  |  | 772,435 | 342,232
Non-employee Directors and Employees [Member] |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount |  |  | $ 2,500,000 |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  | 2 years 9 months 18 days |
Minimum [Member] |  |  |  |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share) |  | $ 10.05 |  |
Maximum [Member] |  |  |  |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share) |  | $ 97.21 |  |
The 2016 Plan [Member] |  |  |  |
Annual Increase, Percentage of Common Shares Outstanding |  |  | 4.00% |
Annual Increase, Number of Common Shares (in shares) | 1,000,000 |  | 268,997 |
Share-based Payment Arrangement, Option [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  | 4 years |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) |  |  | 10 years |
Share-based Payment Arrangement, Option [Member] | The 2016 Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) |  |  | 133,330 |
Restricted Stock Units (RSUs) [Member] |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount |  |  | $ 61,000 |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  | 4 months 24 days |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  | 131,375 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares) |  |  | 118,472 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares) |  |  | 200,271 | 224,311
Restricted Stock Units (RSUs) [Member] | Non-employee Directors and Employees [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number, Ending Balance (in shares) |  |  | 200,271 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares) |  |  | 194,803 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares) |  |  | 5,468 |
Restricted Stock Units (RSUs) [Member] | Management [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  | 112,583 | 113,976
Restricted Stock Units (RSUs) [Member] | Director [Member] |  |  |  |
Number of Share-based Awards Granted Quarterly, Numerator in Ratio |  |  |  | $ 92,500
Number of Share-based Awards Granted Quarterly, Denominator in Ratio |  |  |  | 4
Restricted Stock Units (RSUs) [Member] | Director [Member] | Share-based Payment Arrangement, Tranche One [Member] |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  | $ 190,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  |  | 122,977
Restricted Stock Units (RSUs) [Member] | Director [Member] | Share-based Payment Arrangement, Tranche Two [Member] |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  | $ 613,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  |  | 69,321
Restricted Stock Units (RSUs) [Member] | Maximum [Member] | Director [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  |  | 2 years

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- Definition Weighted average remaining 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 No definition available. + Details
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