Note 2 - Investments - Fair Value Hierarchy (Details) - USD ($)	Mar. 31, 2019	Jul. 01, 2018
Fair Value, Inputs, Level 1 [Member]
Fair Value	$ 6,857,904	$ 6,641,650
Fair Value, Inputs, Level 2 [Member]
Fair Value	630,720	333,029
Fair Value, Inputs, Level 3 [Member]
Fair Value
Certificates of Deposit and Treasury Bill [Member]
Fair Value	630,720	333,029
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	630,720	333,029
Certificates of Deposit and Treasury Bill [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value
Equity Securities [Member]
Fair Value	4,965,174	4,816,804
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value	4,965,174	4,816,804
Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value
Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value
Mutual Funds [Member]
Fair Value	1,892,730	1,824,846
Mutual Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value	1,892,730	1,824,846
Mutual Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value
Mutual Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value