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Note 11 - Shareholders' Equity (Details Textual) - USD ($)	1 Months Ended	3 Months Ended		12 Months Ended
	Jan. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2021	Dec. 31, 2020
Share-based Payment Arrangement, Expense				$ 674,000	$ 812,000
Stock Issued During Period, Shares, New Issues (in shares)		6,793,798	108,879
Proceeds from Issuance of Common Stock				31,936,000	0
Payments of Stock Issuance Costs				1,157,000
Selling, General and Administrative Expenses [Member]
Share-based Payment Arrangement, Expense				$ 625,000	$ 735,000
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				$ 252,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)				1 year 1 month 6 days
Restricted Stock Units (RSUs) [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)				3 months 18 days
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount				$ 33,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)				90,343	219,596
Performance Stock Units [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)				3 years 6 months
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount				$ 59,000
Performance Stock Units [Member] \| Selling, General and Administrative Expenses [Member]
Share-based Payment Arrangement, Expense				$ 77,000
Performance Stock Units [Member] \| Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)	500,000