Note 7 - Investments and Fair Value of Financial Instruments - Investments (Details) - USD ($)	Dec. 31, 2017	Jun. 30, 2017
Investments, cost	$ 3,376,487	$ 3,543,208
Investments, gross unrealized gains	203,720	85,219
Investments, gross unrealized losses	(212,352)	(49,678)
Investments	3,367,855	3,578,749
Money Market Funds [Member]
Investments, cost	479,910	86,204
Investments, gross unrealized gains
Investments, gross unrealized losses
Investments	479,910	86,204
Mutual Fund [Member]
Investments, cost	2,500,000	2,500,000
Investments, gross unrealized gains	203,720
Investments, gross unrealized losses		(49,080)
Investments	2,703,720	2,450,920
Hedge Asset [Member]
Investments, cost	395,000	187,000
Investments, gross unrealized gains		43,746
Investments, gross unrealized losses	(211,912)
Investments	183,088	230,746
ETF [Member]
Investments, cost		768,427
Investments, gross unrealized gains		41,473
Investments, gross unrealized losses
Investments		809,900
Other Equities [Member]
Investments, cost	1,577	1,577
Investments, gross unrealized gains
Investments, gross unrealized losses	(440)	(598)
Investments	$ 1,137	$ 979

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.2)
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