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Note 9 - Stock Options and Restricted Stock (Details Textual) - USD ($)			3 Months Ended
	Jan. 01, 2016	Jul. 27, 2010	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021	Jul. 18, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)			1,334		1,334
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares)			0	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)			0	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		181,221
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)			0
Restricted Stock [Member] \| Share-Based Payment Arrangement, Nonemployee [Member]
Share-Based Payment Arrangement, Expense			$ 60,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)			70,340
Restricted Stock [Member] \| Selling, General and Administrative Expenses [Member]
Share-Based Payment Arrangement, Expense			$ 21,000	$ 24,000
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	$ 0
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