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Note 11 - Stock Based Compensation and Other Plans (Details Textual) - USD ($) $ / shares in Thousands |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Jan. 19, 2021 | Aug. 08, 2002 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Payment Arrangement, Expense |  |  | $ 136,000 | $ 235,000 |
The 2018 Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  | 585,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares) |  |  | 565,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) |  |  | 0 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) |  |  | $ 0 |  |
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, Gross (in shares) |  |  |  | 320,000 |
The 2018 Plan [Member] | Share-based Payment Arrangement, Option [Member] |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  | $ 34,000 | $ 90,000 |
Share-based Payment Arrangement, Expense, Tax Benefit |  |  | 8,000 | $ 22,000 |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  |  | $ 41,000 |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  | 2 years |  |
The 2018 Plan [Member] | Restricted Stock [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  | 0 | 0 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares) |  |  |  |  | 10,000
Share-based Payment Arrangement, Expense |  |  | $ 0 | $ 4,000 |
Share-based Payment Arrangement, Expense, Tax Benefit |  |  | 0 | 1,000 |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  |  | $ 0 | 0 |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  | 4 years |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value |  |  | $ 0 | 7,000 |
The 2018 Plan [Member] | Restricted Stock [Member] | Share-based Compensation, Annual [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  | 25.00% |  |
The 2008 Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  | 3,044,927 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) |  |  | $ 0 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value |  |  | $ 6,000 | 257,000 |
Share-based Payment Arrangement, Expense |  |  | 95,000 | 139,000 |
Share-based Payment Arrangement, Expense, Tax Benefit |  |  | 24,000 | $ 35,000 |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  |  | $ 17,000 |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  | 1 year |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) |  |  |  |  |
The 2008 Plan [Member] | Restricted Stock [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  | 0 | 0 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares) |  |  |  |  | 1,000
Share-based Payment Arrangement, Expense |  |  | $ 0 | $ 1,200 |
Share-based Payment Arrangement, Expense, Tax Benefit |  |  | 0 | 0 |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  |  | $ 0 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  | 4 years |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value |  |  | $ 0 | $ 1,000 |
The 2008 Plan [Member] | Restricted Stock [Member] | Share-based Compensation, Annual [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  | 25.00% |  |
The 2020 Plan [Member] | Subsequent Event [Member] | The 19 Employees [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | 125,000 |  |  |  |
The 2020 Plan [Member] | Subsequent Event [Member] | Director One [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | 10,000 |  |  |  |
The 2020 Plan [Member] | Subsequent Event [Member] | Each Member of Board of Directors [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | 50,000 |  |  |  |
The 2020 Plan [Member] | Subsequent Event [Member] | Director Two [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | 10,000 |  |  |  |
The 2020 Plan [Member] | Subsequent Event [Member] | Director Three [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | 10,000 |  |  |  |
The 2020 Plan [Member] | Subsequent Event [Member] | Director Four [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | 10,000 |  |  |  |
The 2020 Plan [Member] | SGRP Shares [Member] | Subsequent Event [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) | 600,000 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) | 550,000 |  |  |  |
The 2020 Plan [Member] | SGRP Shares for Each of Up to First Three Additional New Directors During Period December 1, 2020, to April 30, 2021 [Member] | Subsequent Event [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) | 50,000 |  |  |  |
The 2020 Plan [Member] | SGRP Shares for Three Additional New Directors During Period December 1, 2020, to April 30, 2021 [Member] | Subsequent Event [Member] | Maximum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) | 700,000 |  |  |  |
The 2020 Plan [Member] | Share-based Payment Arrangement, Option [Member] | Subsequent Event [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) | 35,000 |  |  |  |
Inducement Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) |  |  | $ 0 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value |  |  | $ 0 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) |  |  | 200,000 | 200,000 |
Inducement Plan [Member] | Share-based Payment Arrangement, Option [Member] |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  | $ 7,000 | $ 0 |
Share-based Payment Arrangement, Expense, Tax Benefit |  |  | 2,000 |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  |  | $ 71,000 |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  | 4 years |  |
ESP Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award Purchase Price of Common Stock Discount Rate |  | 15.00% |  |  |
CSP Plan [Member] |  |  |  |  |
Affiliate Purchase Price of Common Stock Percent |  | 15.00% |  |  |

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