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Note 7 - Shareholders' Equity (Details Textual) - USD ($)	1 Months Ended		3 Months Ended			6 Months Ended		9 Months Ended
	Jun. 30, 2021	Jan. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Jun. 30, 2021	Sep. 30, 2021	Sep. 30, 2020
Share-based Payment Arrangement, Expense			$ 218,000		$ 281,000			$ 596,000	$ 601,000
Share-based Payment Arrangement, Plan Modification, Incremental Cost	$ 41,000
Stock Issued During Period, Shares, New Issues (in shares)			6,793,798	108,879
Proceeds from Issuance of Common Stock						$ 31,936,000		31,936,000
Payments of Stock Issuance Costs						1,157,000
Selling, General and Administrative Expenses [Member]
Share-based Payment Arrangement, Expense			$ 188,000		$ 250,000			515,000	$ 536,000
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			393,969			393,969		$ 393,969
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)								1 year 2 months 12 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			78,656			$ 78,656		$ 78,656
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)								90,343
Performance Stock Units [Member] \| Selling, General and Administrative Expenses [Member]
Share-based Payment Arrangement, Expense			$ 17,000					$ 51,000
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