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Note 10 - Shareholders' Equity (Details Textual) - USD ($)	1 Months Ended	3 Months Ended		12 Months Ended
	Jan. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2022	Dec. 31, 2021	Nov. 30, 2022
Share-Based Payment Arrangement, Expense				$ 420,000	$ 674,000
Stock Issued During Period, Shares, New Issues (in shares)		6,793,798	108,879
Proceeds from Issuance of Common Stock				0	31,936,000
Payments of Stock Issuance Costs					1,157,000
Stock Repurchase Program, Authorized Amount						$ 5,000,000.0
Selling, General and Administrative Expenses [Member]
Share-Based Payment Arrangement, Expense				$ 401,000	625,000
Share-Based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)				10 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)				4 years
Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount				$ 137,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)				10 months 24 days
Restricted Stock Units (RSUs) [Member]
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)				4 months 24 days
Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount				$ 62,000
Performance Stock Units [Member]
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)				2 years 6 months
Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount				$ 23,300
Performance Stock Units [Member] \| Chief Executive Officer [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Period Increase (Decrease), Total (in shares)	(50,000)
Performance Stock Units [Member] \| Chief Financial Officer [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Period Increase (Decrease), Total (in shares)	(33,333)
Performance Stock Units [Member] \| Selling, General and Administrative Expenses [Member]
Share-Based Payment Arrangement, Expense				$ 36,000	$ 77,000