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Note 2 - Summary of Significant Accounting Policies (Details Textual)		3 Months Ended		6 Months Ended
	Nov. 09, 2021 shares	Jun. 30, 2022 USD ($) shares	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) shares	Jun. 30, 2021 USD ($) shares	Dec. 31, 2021 USD ($)	Sep. 30, 2021
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) \| shares				1,216,149	0
Income Tax Expense (Benefit), Total		$ 0	$ 0	$ 0	$ 0
Cash Equivalents, at Carrying Value, Total		0		0		$ 0
Cash, Uninsured Amount		0		0		331,385
Restricted Cash, Total		0		0		5,000,000
Accounts Receivable, Allowance for Credit Loss, Current		0		0		$ 0
Accounts Receivable, Allowance for Credit Loss, Writeoff				20,000.00	0.0
Number of Finite-Lived Intangible Assets							2
Impairment of Intangible Assets (Excluding Goodwill), Total				$ 0	$ 0
Customer Base [Member]
Finite-Lived Intangible Asset, Useful Life (Year)				20 years
Trade Names [Member]
Finite-Lived Intangible Asset, Useful Life (Year)				3 years
Domestic Tax Authority [Member]
Operating Loss Carryforwards		197,800,000		$ 197,800,000
Operating Loss Carryforwards, Amount Subject to Expiration		140,600,000		140,600,000
Operating Loss Carryforwards, Amount Not Subject to Expiration		57,200,000		57,200,000
Tax Credit Carryforward, Amount		4,300,000		4,300,000
State and Local Jurisdiction [Member]
Operating Loss Carryforwards		112,200,000		112,200,000
Tax Credit Carryforward, Amount		$ 300,000		$ 300,000
Restricted Stock Units (RSUs) [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) \| shares				60,066
The Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares) \| shares		3,597,557		3,597,557
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) \| shares		2,186,964		2,186,964
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in shares) \| shares	3,000,000
Common Stock, Capital Shares Reserved for Future Issuance (in shares) \| shares		18,378		18,378
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)				10 years
The ESPP [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) \| shares		1,025,000		1,025,000
Percentage of Common Stock Outstanding of Preceding Year				10.00%
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Limited Per Year (in shares) \| shares		100,000		100,000
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Subscription Rate		15.00%		15.00%
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Offering Date				85.00%