Note 12 - Related Party Transaction (Details Textual) - USD ($)			3 Months Ended
	Nov. 12, 2021	Dec. 18, 2019	Apr. 30, 2022	Apr. 30, 2021	Jan. 31, 2022
Preferred Stock, Par or Stated Value Per Share (in dollars per share)			$ 1.00		$ 1.00
Proceeds from Issuance of Preferred Stock and Preference Stock			$ 0	$ 503,000
Proceeds from Issuance of Common Stock			$ 0	$ 42,000
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
Ladenburg Thalmann and Co. Inc. [Member] | Second ATM Offering Program [Member] | Common Stock [Member]
Stock Issued During Period, Shares, New Issues (in shares)			0	18,053
Payments of Stock Issuance Costs				$ 1,000
Proceeds from Issuance of Common Stock				$ 42,000
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	20,960
Proceeds from Issuance of Preferred Stock and Preference Stock				$ 503,000
Payments of Stock Issuance Costs				$ 10,000