Note 2 - Investments - Fair Value Hierarchy (Details) - USD ($)	Sep. 30, 2018	Jul. 01, 2018
Fair Value, Inputs, Level 1 [Member]
Fair Value Hierarchy	$ 6,893,444	$ 6,641,650
Fair Value, Inputs, Level 2 [Member]
Fair Value Hierarchy	233,907	333,029
Fair Value, Inputs, Level 3 [Member]
Fair Value Hierarchy
Certificates of Deposit and Treasury Bill [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value Hierarchy
Certificates of Deposit and Treasury Bill [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value Hierarchy	233,907
Certificates of Deposit and Treasury Bill [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Hierarchy
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value Hierarchy	5,071,199	4,816,804
Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value Hierarchy
Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Hierarchy
Mutual Fund [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value Hierarchy	1,822,245	1,824,846
Mutual Fund [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value Hierarchy
Mutual Fund [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Hierarchy
Certificates of Deposit [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value Hierarchy
Certificates of Deposit [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value Hierarchy		333,029
Certificates of Deposit [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Hierarchy