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Note 7 - Stock-based Compensation and Other Plans (Details Textual) - USD ($)		3 Months Ended		6 Months Ended
	Jan. 19, 2021	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
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		$ 183,000	$ 70,000	$ 282,000	$ 95,000
Share-based Payment Arrangement, Expense, Tax Benefit		46,000	11,000	78,000	17,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total			707,000		707,000
The 2018 Plan [Member] | Restricted Stock [Member]
Share-based Payment Arrangement, Expense		12,000	0	18,000	0
Share-based Payment Arrangement, Expense, Tax Benefit		3,000	$ 0	4,000	$ 0
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total		$ 32,000		$ 32,000
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 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 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 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 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] | Share-based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)	35,000
The 2020 Plan [Member] | SGRP Shares [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]
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

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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