Note 1 - Organization and Liquidity (Details Textual) - USD ($)		3 Months Ended	6 Months Ended
Aug. 21, 2023	Jul. 31, 2023	Apr. 30, 2023	Jul. 31, 2023	Jul. 31, 2022
Working Capital (Deficit)		$ 12,600,000		$ 12,600,000
Cash		494,000		494,000
Unbilled Contracts Receivable		17,000,000.0		17,000,000.0
Payments of Ordinary Dividends, Preferred Stock and Preference Stock		$ 0	$ 0	$ (0)	$ 1,894,000
Klein Marine Services, Inc. [Member] \| Subsequent Event [Member]
Disposal Group, Including Discontinued Operation, Consideration	$ 11,500,000
Proceeds from Divestiture of Businesses, Net of Cash Divested	$ 7,300,000

Represents the value of total current assets net of current liabilities as of the balance sheet date.

No definition available.

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- Definition

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation.

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- Definition

Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation.

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	instant

- Definition

Amount of cash outflow in the form of ordinary dividends to preferred shareholders of the parent entity.

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- Definition

This element represents the cash inflow during the period from the sale of a component of the entity.

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- Definition

Unbilled amounts due for services rendered or to be rendered, actions taken or to be taken, or a promise to refrain from taking certain actions in accordance with the terms of a legally binding agreement between the entity and, at a minimum, one other party. An example would be amounts associated with contracts or programs where the recognized revenue for performance thereunder exceeds the amounts billed under the terms thereof as of the date of the balance sheet.

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