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Note 7 - Shareholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Thousands |  |  |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Nov. 23, 2020 | Jul. 25, 2018 | Dec. 30, 2010 | Oct. 31, 2020 | Apr. 30, 2019 | Jan. 31, 2018 | Jun. 30, 2014 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2004
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares) |  |  |  |  |  |  |  | 1,217,163 | 1,541,792 | 1,576,087 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) |  |  |  |  |  |  |  | 256,000 | 282,500 |  |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share) |  |  |  |  |  |  |  | $ 6.51 | $ 8.27 |  |
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount |  |  |  |  |  |  |  | $ 566 |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  |  |  |  |  |  | 1 year 1 month 6 days |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) |  |  |  |  |  |  |  | $ 2.78 | $ 3.77 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value |  |  |  |  |  |  |  | $ 427 | $ 931 |  |
Proceeds from Stock Options Exercised |  |  |  |  |  |  |  | $ 238 | $ 930 |  |
Common Stock, Capital Shares Reserved for Future Issuance (in shares) |  |  |  |  |  |  |  | 249,604 |  |  |
Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  |  |  |  |  |  | 1 year 10 months 24 days |  |  |
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount |  |  |  |  |  |  |  | $ 70 |  |  |
The 2004 Long-term Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) |  |  |  |  |  |  |  | 2,900,000 |  |  | 750,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares) |  |  |  |  |  |  |  | 73,995 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) | 37,171 |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share) | $ 7.33 |  |  |  |  |  |  |  |  |  |
The 2004 Long-term Incentive Plan [Member] | President [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) |  |  | 5 years |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) | 26,929 |  |  |  |  |  |  |  |  |  |
Option Accelerated Vesting, Stock Price Trigger (in dollars per share) |  | $ 10.00 |  |  |  |  |  |  |  |  |
Option Accelerated Vesting, Threshold Trading Days (Day) |  | 15 days |  |  |  |  |  |  |  |  |
The 2004 Long-term Incentive Plan [Member] | Options I [Member] | President [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, Options, Grants in Period, Gross (in shares) |  |  | 50,000 |  |  |  |  |  |  |  |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share) |  |  | $ 6.42 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Incremental Vesting Shares (in shares) |  |  | 12,500 |  |  |  |  |  |  |  |
The 2004 Long-term Incentive Plan [Member] | Options II [Member] | President [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, Options, Grants in Period, Gross (in shares) |  |  | 250,000 |  |  |  |  |  |  |  |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share) |  |  | $ 6.42 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Incremental Vesting Shares (in shares) |  |  | 62,500 |  |  |  |  |  |  |  |
The 2004 Long-term Incentive Plan [Member] | Options III [Member] | President [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, Options, Grants in Period, Gross (in shares) |  |  | 200,000 |  |  |  |  |  |  |  |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share) |  |  | $ 10.00 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Incremental Vesting Shares (in shares) |  |  | 50,000 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Minimum Closing Share Price (in dollars per share) |  |  | $ 10.00 |  |  |  |  |  |  |  |
The 2004 Long-term Incentive Plan [Member] | Options IV [Member] | President [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, Options, Grants in Period, Gross (in shares) |  |  | 200,000 |  |  |  |  |  |  |  |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share) |  |  | $ 15.00 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Incremental Vesting Shares (in shares) |  |  | 50,000 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Minimum Closing Share Price (in dollars per share) |  |  | $ 15.00 |  |  |  |  |  |  |  |
The 2014 Long-term Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) |  |  |  |  |  |  | 1,750,000 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares) |  |  |  |  |  |  |  | 1,143,168 |  |  |
The 2014 Long-term Incentive Plan [Member] | Awards Other than Stock Options and SARs [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) |  |  |  |  |  |  | 800,000 |  |  |  |
The 2014 Long-term Incentive Plan [Member] | Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  |  |  |  | 3 years |  |  |  |  |
Stock Issued During Period, Shares, Restricted Stock Award, Gross (in shares) |  |  |  | 5,000 | 20,000 | 17,500 |  |  |  |  |
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) |  |  |  | $ 6.08 | $ 11.12 | $ 7.16 |  |  |  |  |
Incentive Stock Options [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  |  |  |  |  | 3 years |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) |  |  |  |  |  |  | 7 years |  |  |  |

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