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Note 4 - Investments (Details Textual) - USD ($)	12 Months Ended
	Apr. 30, 2021	Dec. 31, 2020	Apr. 30, 2020	Dec. 31, 2019	Apr. 30, 2019	May 01, 2018
Equity Securities, FV-NI, Cost	$ 19,105,000		$ 12,877,000
Equity Securities, FV-NI, Total	23,582,000		14,125,000			$ 9,379,000
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent, Total	(128,000)	$ 97,000	97,000	$ 36,000	$ 36,000
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, Tax	(45,000)		37,000		10,000
Proceeds from Sale of Equity Securities, FV-NI	8,212,000		4,387,000
Equity Securities, FV-NI, Gain (Loss), Total	1,481,000		(581,000)		$ 0
Equity Method Investments	60,977,000		59,165,000
EAM Trust [Member]
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
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	$ 4,664,000		2,949,000
Fixed Income Securities [Member]
Proceeds from Sale and Maturity of Debt Securities, Available-for-sale, Total	14,902,000		8,663,000
AOCI, Debt Securities, Available-for-sale, Adjustment, after Tax, Total	4,000		177,000
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent, Total	(173,000)		134,000
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, Tax	$ (45,000)		$ 37,000
Debt Securities, Available-for-Sale, Weighted Average Yield	1.40%		2.27%
Fixed Income Securities [Member] | AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]
AOCI Tax, Attributable to Parent	$ 1,000		$ 46,000

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=124509347&loc=d3e681-108580

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

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Weighted average yield 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/2009/role/commonPracticeRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1403
-Paragraph (a)

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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

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-Topic 323
-SubTopic 10
-Section 35
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Cost of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). Excludes equity method investment and investment in equity security without readily determinable fair value.

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Amount after tax and 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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Amount, before adjustment, of tax expense (benefit) for unrealized holding gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Excludes tax expense (benefit) for unrealized gain (loss) on investment in debt security measured at amortized cost (held-to-maturity) from transfer to available-for-sale.

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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).

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Amount of cash inflow from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as investing activity.

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

+ References

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