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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%