Note 2 - Investments - Fair Value Hierarchy (Details) - USD ($)	Sep. 27, 2020	Jun. 28, 2020
Fair Value	$ 5,344,294	$ 5,216,218
Fair Value, Inputs, Level 1 [Member]
Fair Value	5,344,294	5,216,218
Fair Value, Inputs, Level 2 [Member]
Fair Value	134,224	134,202
Fair Value, Inputs, Level 3 [Member]
Fair Value
Certificates of Deposits and Treasury Bills [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value
Certificates of Deposits and Treasury Bills [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value	134,224	134,202
Certificates of Deposits and Treasury Bills [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value
Equity Securities [Member]
Fair Value	4,853,973	4,725,470
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value	4,853,973	4,725,470
Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value
Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value
Mutual Fund [Member]
Fair Value	490,321	490,748
Mutual Fund [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value	490,321	490,748
Mutual Fund [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value
Mutual Fund [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value