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Note 11 - Stock Based Compensation and Other Plans (Details Textual) - USD ($) |  |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Aug. 02, 2021 | Feb. 22, 2021 | Jan. 19, 2021 | Aug. 31, 2020 | Aug. 08, 2002 | Dec. 31, 2021 | Dec. 31, 2020 | Jun. 04, 2021
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures, Total (in shares) |  |  |  |  |  | 0 |  |
Share-based Payment Arrangement, Expense |  |  |  |  |  | $ 711,000 | $ 136,000 |
Chief Executive Officer [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures, Total (in shares) |  | 630,000 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) |  | $ 1.90 |  |  |  |  |  |
Chief Financial Officer [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures, Total (in shares) |  |  |  | 200,000 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) |  |  |  | $ 0.85 |  |  |  |
SGRP Shares [Member] | Chief Global Commercial Officer [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | 26,882 |  |  |  |  |  |  |
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) | $ 1.86 |  |  |  |  |  |  |
SGRP Shares [Member] | Chief Strategy and Growth Officer [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | 26,882 |  |  |  |  |  |  |
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) | $ 1.86 |  |  |  |  |  |  |
SGRP Shares [Member] | Chief Executive Officer [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value |  | $ 50,000 |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] | Chief Global Commercial Officer [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) | 1 year |  |  |  |  |  |  |
Share Based Compensation Arrangement by Share Based Payment Award Equity Instruments Other than Options Granted in Period Total Fair Value | $ 50,000 |  |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] | Chief Strategy and Growth Officer [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) | 1 year |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value | $ 50,000 |  |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] | Chief Executive Officer [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  | 26,315 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  | 1 year |  |  |  |  |  |
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) |  | $ 1.90 |  |  |  |  |  |
Share-based Payment Arrangement, Option [Member] | Chief Financial Officer [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  |  | 3 years |  |  |  |
Share-based Payment Arrangement, Option [Member] | Chief Financial Officer [Member] | Share-based Payment Arrangement, Tranche One [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  |  | 25.00% |  |  |  |
Restricted Stock [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  |  |  |  | 1 year |  |
The 2021 Plan [Member] | SGRP Shares [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) |  |  |  |  |  |  |  | 400,000
The 2021 Plan [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) |  |  |  |  |  |  |  | 150,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  |  |  |  | 58,011 |  |
The 2021 Plan [Member] | Restricted Stock Units (RSUs) [Member] | Share-based Payment Arrangement, Employee [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  |  |  |  | 3 years |  |
The 2021 Plan [Member] | Share-based Payment Arrangement, Option [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  |  |  |  | 4 years |  |
The 2020 Plan [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value |  |  |  |  |  | $ 0 | 0 |
The 2020 Plan [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] | 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] | 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] | 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] | 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] | 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] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) |  |  | 550,000 |  |  |  |  |
The 2020 Plan [Member] | Share-based Payment Arrangement, Option [Member] |  |  |  |  |  |  |  |
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) |  |  |  |  |  | $ 1.55 |  |
Share-based Payment Arrangement, Expense |  |  |  |  |  | $ 57,000 | 0 |
Share-based Payment Arrangement, Expense, Tax Benefit |  |  |  |  |  | 16,000 | 0 |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  |  |  |  |  | $ 188,000 |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  |  |  |  | 3 years |  |
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] |  |  |  |  |  |  |  |
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] | Maximum [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) |  |  | 700,000 |  |  |  |  |
The 2020 Plan [Member] | SGRP Shares for One Additional New Director On Plan Effective Date [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) |  |  | 600,000 |  |  |  |  |
The 2008 Plan [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value |  |  |  |  |  | $ 295,000 | 6,000 |
Share-based Payment Arrangement, Expense |  |  |  |  |  | 13,000 | 37,000 |
Share-based Payment Arrangement, Expense, Tax Benefit |  |  |  |  |  | 3,000 | 23,000 |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  |  |  |  |  | $ 0 |  |
The 2018 Plan [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures, Total (in shares) |  |  |  |  |  | 0 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value |  |  |  |  |  | $ 235,000 | 3,000 |
The 2018 Plan [Member] | Share-based Payment Arrangement, Option [Member] |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  |  | 23,000 | 28,000 |
Share-based Payment Arrangement, Expense, Tax Benefit |  |  |  |  |  | 6,000 | $ 8,000 |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  |  |  |  |  | $ 8,000 |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  |  |  |  | 1 year |  |
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) |  |  |  |  |  |  | 80,079 |
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) |  |  |  |  |  |  | $ 1.87 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value |  |  |  |  |  |  | $ 0 |
Share-based Payment Arrangement, Expense |  |  |  |  |  | $ 87,000 | 0 |
Share-based Payment Arrangement, Expense, Tax Benefit |  |  |  |  |  | 21,000 | 0 |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  |  |  |  |  | 66,000 |  |
Inducement Plan [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value |  |  |  |  |  | 37,000 | 0 |
Share-based Payment Arrangement, Expense |  |  |  |  |  | 22,000 | 7,000 |
Share-based Payment Arrangement, Expense, Tax Benefit |  |  |  |  |  | 5,000 | $ 2,000 |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  |  |  |  |  | $ 52,000 |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  |  |  |  | 3 years |  |
CEO Inducement Plan [Member] |  |  |  |  |  |  |  |
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) |  |  |  |  |  | $ 1.90 |  |
CEO Inducement Plan [Member] | Share-based Payment Arrangement, Option [Member] |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  |  | $ 509,000 |  |
Share-based Payment Arrangement, Expense, Tax Benefit |  |  |  |  |  | 126,000 |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  |  |  |  |  | $ 85,000 |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  |  |  |  | 1 month 6 days |  |
ESP Plan [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award Purchase Price of Common Stock Discount Rate |  |  |  |  | 15.00% |  |  |
Affiliate Purchase Price of Common Stock Percent |  |  |  |  | 15.00% |  |  |

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