Note 6 - Income Taxes (Details Textual) - USD ($)	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Domestic Tax Authority [Member]
Deferred Tax Assets, Net of Valuation Allowance	$ 5,000,000
Operating Loss Carryforwards	9,600,000
State and Local Jurisdiction [Member]
Operating Loss Carryforwards	5,200,000
Her Majesty's Revenue and Customs (HMRC) [Member]
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount	200,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	0	$ 0
Deferred Tax Liabilities, Undistributed Foreign Earnings	0	0
Annual Utilization of Previously Incurred Net Operating Loss	600,000
Deferred Tax Assets, Valuation Allowance	4,939,000	5,019,000
Excess Tax Benefits from Share-based Compensation	700,000
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount	$ 577,000