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Note 6 - Shareholders' Equity (Details Textual) - USD ($)	1 Months Ended	3 Months Ended		9 Months Ended			12 Months Ended
	Jan. 31, 2022	Sep. 30, 2022	Sep. 30, 2021	Oct. 01, 2022	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Share-Based Payment Arrangement, Expense		$ 184,000	$ 218,000		$ 298,000	$ 596,000
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		169,706			$ 169,706
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, Option, Cost Not yet Recognized, Amount		141,416			$ 141,416
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)					6 months
Performance Stock Units [Member]
Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount		30,200			$ 30,200
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)					2 years 9 months 18 days
Share-Based Payment Arrangement, Expense		$ 8,100	$ 17,000		$ 29,100	$ 51,000
Performance Stock Units [Member] \| Mr. Derrickson [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] \| Mr. Wheaton [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Period Increase (Decrease), Total (in shares)	(33,333)