Note 7 - Subsequent Events (Details Textual) - USD ($) $ / shares in Units, $ in Thousands				6 Months Ended
	Apr. 19, 2022	Jul. 27, 2021	Jul. 27, 2021	Mar. 31, 2022	Mar. 31, 2021
Stock Issued During Period, Shares, New Issues (in shares)		945,946	945,946
Shares Issued, Price Per Share (in dollars per share)		$ 3.70	$ 3.70
Proceeds from Issuance of Common Stock				$ 20	$ 10
Public Offering [Member] | Subsequent Event [Member]
Stock Issued During Period, Shares, New Issues (in shares)	1,700,000
Shares Issued, Price Per Share (in dollars per share)	$ 2.55
Proceeds from Issuance of Common Stock	$ 4,300
Over-Allotment Option [Member] | Subsequent Event [Member]
Equity Offering, Underwritten Option Shares (in shares)	255,000