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Note 8 - Stock-based Compensation and Other Plans (Details Textual) - USD ($)
3 Months Ended
Aug. 02, 2021
Feb. 22, 2021
Jan. 19, 2021
Aug. 31, 2020
Mar. 31, 2022
Mar. 31, 2021
Jun. 04, 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, Award Vesting Period (Year)   1 year          
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, 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, Options, Grants in Period, Net of Forfeitures, Total (in shares)         600,000    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)         160,000    
The 2018 Plan [Member] | Share-Based Payment Arrangement, Option [Member]              
Share-Based Payment Arrangement, Expense         $ 110,000 $ 96,000  
Share-Based Payment Arrangement, Expense, Tax Benefit         27,000 24,000  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total         228,000    
The 2018 Plan [Member] | Restricted Stock [Member]              
Share-Based Payment Arrangement, Expense         40,000 5,000  
Share-Based Payment Arrangement, Expense, Tax Benefit         10,000 $ 1,000  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total         $ 116,000    
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, 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 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] | 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] | 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] | 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, 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 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, Outstanding, Number, Ending Balance (in shares)         691,162