Note 11 - Income Taxes (Details Textual) - USD ($)	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
State and Local Jurisdiction [Member] | New York State Division of Taxation and Finance [Member] | State Tax Code Change [Member]
Unrecognized Tax Benefits				$ 362,000
State and Local Jurisdiction [Member] | New York State Division of Taxation and Finance [Member]
Deferred Tax Assets, Operating Loss Carryforwards, State and Local		$ 1,716,000	$ 1,716,000
Deferred Tax Assets, Valuation Allowance		1,716,000	1,716,000
Deferred State and Local Income Tax Expense (Benefit)		0	6,000	489,000
State and Local Jurisdiction [Member] | Oregon State Tax [Member] | Scenario, Forecast [Member]
Deferred Tax Assets, Research and Development Credit, Expired During Period	$ 25,000
State and Local Jurisdiction [Member] | Oregon State Tax [Member]
Deferred Tax Assets, Operating Loss Carryforwards, State and Local		162,000	173,000
Deferred Tax Assets, Research and Development Credit, Expired During Period		11,000
Domestic Tax Authority [Member]
Deferred Tax Assets, Capital Loss Carryforwards		456,000	506,000
Foreign Tax Authority [Member] | Canada Revenue Agency [Member]
Deferred Tax Assets, Operating Loss Carryforwards, Foreign			4,272,000
Deferred Tax Assets, Valuation Allowance		6,150,000	6,161,000
Deferred Tax Assets, Capital Loss Carryforwards		4,272,000	4,272,000
Unrecognized Tax Benefits		$ 421,000	447,000
Oregon Net Operating Loss, Term		4 years
Unrecognized Tax Benefits, Interest on Income Taxes Accrued		$ 244,000	292,000
Unrecognized Tax Benefits, Income Tax Penalties Accrued		142,000	152,000
Reserve for Unrecognized Tax Benefits, Including Penalties and Interest		807,000	891,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate		665,000	739,000
Unrecognized Tax Benefits, Period Increase (Decrease)		26,000	40,000	147,000
Unrecognized Tax Benefits, Interest on Income Taxes Expense		48,000	41,000	62,000
Unrecognized Tax Benefits, Income Tax Penalties Expense		$ 10,000	$ 17,000	$ 50,000