Note 8 - Stockholders' Equity (Details Textual)				1 Months Ended
	Jan. 19, 2023 USD ($) $ / shares shares	Dec. 23, 2022 $ / shares shares	Oct. 05, 2020 $ / shares shares	Dec. 31, 2022 USD ($)	Mar. 31, 2023 shares	Jun. 30, 2022 shares	Mar. 31, 2022 shares	Sep. 23, 2020 shares
Common Stock, Shares Authorized (in shares)					45,000,000	45,000,000
Preferred Stock, Shares Authorized (in shares)					15,000,000
Common Stock, Shares, Outstanding (in shares)					7,306,718	6,769,923
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares)					501,000		100,000
Preferred Stock, Shares Issued (in shares)					0
Rights Agreement, Exercise Price (in dollars per share) | $ / shares			$ 100.00
Rights Agreement, Number of Preferred Stock Issuable Per Right (in shares)			0.001
Person or Group [Member]
Rights Agreement, Beneficial Ownership Percentage of Common Stock,Threshold			18.00%
Certain Passive Investors [Member]
Rights Agreement, Beneficial Ownership Percentage of Common Stock,Threshold			20.00%
January 2023 Warrants [Member] | Measurement Input, Risk Free Interest Rate [Member]
Warrants and Rights Outstanding, Measurement Input	0.0465
January 2023 Warrants [Member] | Measurement Input, Expected Term [Member]
Warrants and Rights Outstanding, Measurement Input	1
January 2023 Warrants [Member] | Measurement Input, Price Volatility [Member]
Warrants and Rights Outstanding, Measurement Input	0.404
January 2023 Warrants [Member] | Measurement Input, Expected Dividend Rate [Member]
Warrants and Rights Outstanding, Measurement Input	0
December 2022 Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares		$ 25.00
December 2022 Warrants [Member] | Measurement Input, Risk Free Interest Rate [Member]
Warrants and Rights Outstanding, Measurement Input				0.0466
December 2022 Warrants [Member] | Measurement Input, Expected Term [Member]
Warrants and Rights Outstanding, Measurement Input				1
Class of Warrant or Right, Distributed for Each Share of Common Stock (in shares)								1
December 2022 Warrants [Member] | Measurement Input, Price Volatility [Member]
Warrants and Rights Outstanding, Measurement Input				0.3773
December 2022 Warrants [Member] | Measurement Input, Expected Dividend Rate [Member]
Warrants and Rights Outstanding, Measurement Input				0
Private Placement [Member]
Stock Issued During Period, Shares, New Issues (in shares)	117,500	283,500
Shares Issued, Price Per Share (in dollars per share) | $ / shares		$ 20.00
Rights Agreement, Exercise Price (in dollars per share) | $ / shares	$ 25.00	$ 25.00
Private Placement Fee, Percentage	3.25%
Proceeds from Issuance of Common Stock, Net | $	$ 2.3			$ 5,600,000
Private Placement [Member] | Petrie Partners Securities, LLC [Member]
Private Placement Fee, Percentage				3.25%
Private Placement [Member] | January 2023 Warrants [Member]
Shares Issued, Price Per Share (in dollars per share) | $ / shares	$ 20.00
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares	$ 25.00
Restricted Stock [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number (in shares)					429,376
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares)					100,000