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Note 6 - Shareholders' Equity (Details Textual) - USD ($)	1 Months Ended	3 Months Ended			6 Months Ended		12 Months Ended
	Jan. 31, 2022	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Share-Based Payment Arrangement, Expense		$ 40,000		$ 210,000	$ 115,000	$ 378,000
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		193,019			$ 193,019
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)					1 year
Restricted Stock Units (RSUs) [Member]
Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount		224,991			$ 224,991
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)					7 months 6 days
Performance Stock Units [Member]
Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount		38,000			$ 38,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)					3 years
Share-Based Payment Arrangement, Expense		$ 9,500		$ 17,000	$ 21,000	$ 34,000
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)