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Note 8 - Stock Options and Restricted Stock (Details Textual) - USD ($)			3 Months Ended	12 Months Ended
	Jan. 01, 2016	Jul. 27, 2010	Jun. 30, 2020	Dec. 31, 2021	Dec. 31, 2020	Sep. 30, 2021	Jan. 21, 2021	Dec. 31, 2019	Jul. 18, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)				1,334	11,569			129,689
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)				0
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares)				181,221	24,393			133,756
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)				6,505	69,777
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)				165,000	10,001
Restricted Stock [Member] \| Former CEO [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)					59,667
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)					6,667
Restricted Stock [Member] \| Selling, General and Administrative Expenses [Member]
Share-based Payment Arrangement, Expense				$ 130,000	$ 389,000
Restricted Stock [Member] \| Selling, General and Administrative Expenses [Member] \| Former CEO [Member]
Severance Costs			$ 301,000
Share-Based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value							$ 0
Share-based Payment Arrangement, Expense				0	$ 3,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total				$ 0
Option Plan 2010 Member
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Outstanding Stock Maximum		15.00%
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)	381,272					0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)	2,541,809
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)	5 years
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)									159,448
Option Plan 2010 Member \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)	1 year
Option Plan 2010 Member \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)	3 years
The 2016 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)									692,782
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)				1,334
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)									533,334
The 2016 Plan [Member] \| Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares)				181,221