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Note 6 - Shareholders' Equity (Details Textual) - USD ($)	1 Months Ended	3 Months Ended		12 Months Ended
	Jan. 31, 2022	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Share-Based Payment Arrangement, Expense		$ 75,000	$ 168,000
Selling, General and Administrative Expenses [Member]
Share-Based Payment Arrangement, Expense		$ 66,000	$ 146,000
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		$ 263,411
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, Option, Cost Not yet Recognized, Amount		$ 9,157
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)		2 months 12 days
Performance Stock Units [Member]
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)		3 years 3 months 18 days
Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount		$ 48,000
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)
Performance Stock Units [Member] \| Selling, General and Administrative Expenses [Member]
Share-Based Payment Arrangement, Expense		$ 12,000