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Note 8 - Stock-based Compensation and Other Plans (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Aug. 12, 2021
Aug. 02, 2021
Feb. 22, 2021
Jan. 19, 2021
Aug. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Jun. 04, 2021
May 01, 2021
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            
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%            
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 Compensation Arrangement by Share Based Payment Award Equity Instruments Other than Options Annual Grant Value     $ 100,000                
The 2018 Plan [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)               600,000      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares)           313,750   313,750      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)           0   0      
The 2018 Plan [Member] | Share-based Payment Arrangement, Option [Member]                      
Share-based Payment Arrangement, Expense           $ 174,000 $ 40,000 $ 457,000 $ 109,000    
Share-based Payment Arrangement, Expense, Tax Benefit           43,000 10,000 114,000 27,000    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total           514,000   514,000      
The 2018 Plan [Member] | Restricted Stock [Member]                      
Share-based Payment Arrangement, Expense           29,000 0 47,000 0    
Share-based Payment Arrangement, Expense, Tax Benefit           $ 7,000 $ 0 $ 12,000 $ 0    
The 2018 Plan [Member] | SGRP Shares [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)               600,000      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares)           365,000   365,000      
The 2008 Plan [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)               874,087      
The 2008 Plan [Member] | SGRP Shares [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares)           1,085,812   1,085,812      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)           0   0      
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] | SGRP Shares [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)               565,000      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)       600,000             0
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total           $ 103,000   $ 103,000      
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]                      
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 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 2021 Plan [Member] | SGRP Shares [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)       125,000       0      
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, Equity Instruments Other than Options, Grants in Period (in shares) 58,011                    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)                   150,000  
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] | Restricted Stock Units (RSUs) [Member] | Director [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)               1 year