Note 2 - Investments - Fair Value Hierarchy (Details) - USD ($)	Dec. 29, 2019	Jun. 30, 2019
Fair Value, Inputs, Level 1 [Member]
Fair Value	$ 6,641,483	$ 7,029,916
Fair Value, Inputs, Level 2 [Member]
Fair Value	134,153	433,249
Fair Value, Inputs, Level 3 [Member]
Fair Value
Certificates of Deposit and Treasury Bill [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value
Certificates of Deposit and Treasury Bill [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value	134,153	433,249
Certificates of Deposit and Treasury Bill [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value
Equity Securities [Member]
Fair Value	5,684,527	5,100,341
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value	5,684,527	5,100,341
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	956,956	1,929,575
Mutual Fund [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value	956,956	1,929,575
Mutual Fund [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value
Mutual Fund [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value