Note 15 - Related Party Transaction (Details Textual) - USD ($)		1 Months Ended	9 Months Ended	12 Months Ended
	Nov. 12, 2021	Sep. 30, 2020	Oct. 31, 2021	Jan. 31, 2023	Jan. 31, 2022
Preferred Stock, Par or Stated Value Per Share (in dollars per share)				$ 1.00	$ 1.00
Common Stock, Par or Stated Value Per Share (in dollars per share)				$ 0.01	$ 0.01
Proceeds from Issuance of Preferred Stock and Preference Stock				$ 0	$ 14,676,000
Proceeds from Issuance of Common Stock				$ 0	$ 43,000
Common Stock [Member]
Stock Issued During Period, Shares, New Issues (in shares)					19,000
Preferred Stock [Member]
Stock Issued During Period, Shares, New Issues (in shares)					645,000
Underwriting Agreement [Member]
Proceeds from Issuance of Preferred Stock and Preference Stock	$ 9,500,000
Payments of Stock Issuance Costs	$ 576,000
Underwriting Agreement [Member] | Preferred Stock [Member]
Stock Issued During Period, Shares, New Issues (in shares)	432,000
Series A Preferred Stock [Member]
Preferred Stock, Dividend Rate, Percentage				9.00%
Ladenburg Thalmann and Co. Inc. [Member] | First ATM Offering Program [Member] | Common Stock [Member]
Equity Offering, Maximum Shares to be Issued (in shares)		5,000,000
Common Stock, Par or Stated Value Per Share (in dollars per share)		$ 0.01
Ladenburg Thalmann and Co. Inc. [Member] | Second ATM Offering Program [Member] | Common Stock [Member]
Stock Issued During Period, Shares, New Issues (in shares)			18,415	0
Payments of Stock Issuance Costs					$ 1,000
Proceeds From Issuance Of Common Stock, Gross					44,000
Proceeds from Issuance of Common Stock					$ 43,000
Ladenburg Thalmann and Co. Inc. [Member] | Series A Preferred Stock [Member] | First ATM Offering Program [Member]
Equity Offering, Maximum Shares to be Issued (in shares)		500,000
Preferred Stock, Dividend Rate, Percentage		9.00%
Preferred Stock, Par or Stated Value Per Share (in dollars per share)		$ 1.00
Equity Offering, Distribution Compensation, Percentage of Gross Proceeds		2.00%
Ladenburg Thalmann and Co. Inc. [Member] | Series A Preferred Stock [Member] | Second ATM Offering Program [Member]
Stock Issued During Period, Shares, New Issues (in shares)				0	212,753
Proceeds from Issuance of Preferred Stock and Preference Stock					$ 5,300,000
Payments of Stock Issuance Costs					106,000
Proceeds From Issuance Of Preferred Stock And Preference Stock, Net					$ 5,200,000