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Note 2 - Investments (Details Textual) - USD ($)		3 Months Ended		12 Months Ended
		Jul. 31, 2019	Jul. 31, 2018	Apr. 30, 2019
Available-for-sale Equity Securities, Amortized Cost Basis, Total		$ 8,940,000		$ 8,541,000
Available-for-sale Securities, Equity Securities		11,112,000		$ 10,622,000
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax, Portion Attributable to Parent, Total		109,000	$ 539,000
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, Tax		$ 23,000	113,000
Available-for-sale Securities, Debt Securities, Average Yield		2.41%		2.09%
Equity Method Investments		$ 58,971,000		$ 58,625,000
EAM Trust [Member]
Equity Method Investments	[1]	58,971,000		58,625,000
Fair Value of Contributed Capital at Inception		55,805,000		55,805,000
Cash and Liquid Securities in Excess of Working Capital Requirements Contributed to Capital Account		5,820,000		5,820,000
Equity Method Investment, Other than Temporary Impairment		0		$ 0
Percentage of Non Voting Profit Interest				50.00%
Accrued Non Voting Revenues and Non Voting Profits Interests Payable		2,843,000		$ 2,420,000
Equity Securities [Member]
Available-for-sale Securities, Gross Realized Gain (Loss), Total		0	0
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax, Portion Attributable to Parent, Total		90,000	538,000
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, Tax		19,000	113,000
AOCI, Debt Securities, Available-for-sale, Adjustment, after Tax, Total		2,172,000	2,082,000
AOCI Tax, Attributable to Parent		456,000	437,000
Proceeds from Sale and Maturity of Debt Securities, Available-for-sale, Total		2,973,000
Debt Securities [Member]
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax, Portion Attributable to Parent, Total		18,000	(2,000)
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, Tax		4,000	(1,000)
AOCI, Debt Securities, Available-for-sale, Adjustment, after Tax, Total		61,000	43,000
AOCI Tax, Attributable to Parent		$ 13,000	9,000
Proceeds from Sale and Maturity of Debt Securities, Available-for-sale, Total			$ 1,637,000
[1] Reported within Long-Term Assets on the Consolidated Condensed Balance Sheets.

X

- Definition

Amount, after tax, of accumulated unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e681-108580

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- Definition

Amount of tax expense (benefit) allocated to accumulated other comprehensive income (loss) attributable to parent.

+ References

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This item represents the cost of equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments for other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References

No definition available.

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- Definition

Amount of equity securities categorized neither as held-to-maturity nor as trading.

+ References

No definition available.

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X

- Definition

This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities.

+ References

No definition available.

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- Definition

This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 35
-Paragraph 32
-URI http://asc.fasb.org/extlink&oid=118954474&loc=d3e32787-111569

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- Definition

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
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-Section 45
-Paragraph 1
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

Amount before tax, after reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities, attributable to parent entity. Excludes amounts related to other than temporary impairment (OTTI) loss.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 810
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-Section 50
-Paragraph 1A
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X

- Definition

Amount of tax expense (benefit) before reclassification adjustments of unrealized holding gain (loss) on available-for-sale securities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 12
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-URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580

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Amount of cash inflow from sale, maturity, prepayment and call of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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X

- Definition

Sum of the carrying values as of the balance sheet date of accrued payable non-voting revenues and non-voting profits interests.

+ References

No definition available.

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X

- Definition

The average yield on debt securities classified as available for sale.

+ References

No definition available.

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X

- Definition

Represents the cash and liquid securities in excess of working capital requirements contributed to capital account.

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No definition available.

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- Definition

Represents the fair value of contributed capital at inception.

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No definition available.

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- Definition

Represents percentage of non-voting profits interest.

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No definition available.

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