Note 8 - Income Taxes - Table of Estimated Deferred Tax Assets and Liabilities (Details) - USD ($)	Jun. 30, 2017	Jun. 30, 2016
NOLs – noncurrent	$ 20,087,000	$ 19,705,000
Stock-based compensation - current	5,589,000	5,392,000
Property and equipment – noncurrent	2,014,000	2,014,000
Deferred compensation - noncurrent	2,017,000	1,688,000
Gross deferred tax assets	29,707,000	28,799,000
Valuation allowance	(29,707,000)	(28,799,000)
Net deferred tax assets