Note 13 - Income Taxes - Components of Company's Deferred Tax Assets and Liabilities for Federal and State Income Taxes (Details) - USD ($)	Dec. 31, 2017	Jun. 30, 2017	Jun. 30, 2016
Deferred tax assets:
Net operating loss carryforwards	$ 29,682,000	$ 43,687,000	$ 41,023,000
Income tax credit carryforwards	2,667,000	2,419,000	2,367,000
Stock compensation	751,000	1,047,000	874,000
Other	831,000	1,124,000	1,858,000
Total deferred tax assets	33,931,000	48,277,000	46,122,000
Deferred tax liabilities
Indefinite lived intangible assets	(4,730,000)	(6,968,000)	(7,641,000)
Depreciation and amortization	(126,000)	(176,000)	(230,000)
Total deferred tax liabilities	(4,856,000)	(7,144,000)	(7,871,000)
Valuation allowance	(33,805,000)	(48,101,000)	(45,892,000)
Net deferred taxes	$ (4,730,000)	$ (6,968,000)	$ (7,641,000)