Note 3 - Investments - Fair Value Hierarchy (Details) - USD ($)	12 Months Ended
Jun. 28, 2020	Jun. 30, 2019
Fair Value	$ 5,216,218	$ 7,029,916
Unrealized gain (loss)	(367,466)	331,149
Cumulative Unrealized gain (loss)	3,461,125	3,828,589
Equity Securities [Member]
Fair Value	4,725,470	5,100,341
Unrealized gain (loss)	(374,871)	283,537
Cumulative Unrealized gain (loss)	3,445,556	3,820,427
Mutual Fund [Member]
Fair Value	490,748	1,929,575
Unrealized gain (loss)	7,405	47,612
Cumulative Unrealized gain (loss)	15,569	8,162
Certificates of Deposit [Member]
Unrealized gain (loss)
Cumulative Unrealized gain (loss)
Fair Value, Inputs, Level 1 [Member]
Fair Value	5,216,218	7,029,916
Fair Value, Inputs, Level 1 [Member] \| Equity Securities [Member]
Fair Value	4,725,470	5,100,341
Fair Value, Inputs, Level 1 [Member] \| Mutual Fund [Member]
Fair Value	490,748	1,929,575
Fair Value, Inputs, Level 1 [Member] \| Certificates of Deposit [Member]
Fair Value
Fair Value, Inputs, Level 2 [Member]
Fair Value	134,202	433,249
Fair Value, Inputs, Level 2 [Member] \| Equity Securities [Member]
Fair Value
Fair Value, Inputs, Level 2 [Member] \| Mutual Fund [Member]
Fair Value
Fair Value, Inputs, Level 2 [Member] \| Certificates of Deposit [Member]
Fair Value	134,202	433,249
Fair Value, Inputs, Level 3 [Member]
Fair Value
Fair Value, Inputs, Level 3 [Member] \| Equity Securities [Member]
Fair Value
Fair Value, Inputs, Level 3 [Member] \| Mutual Fund [Member]
Fair Value
Fair Value, Inputs, Level 3 [Member] \| Certificates of Deposit [Member]
Fair Value

Amount of accumulated unrealized gain (loss) on investment in trading security.

No definition available.

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- Definition

Amount of unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in net income (trading).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27357-111563

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- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.4)
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

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