Note 11 - Income Taxes (Details Textual) - USD ($)	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 925,000	$ 665,000
Unrecognized Tax Benefits, Period Increase (Decrease)	78,000	26,000	$ 40,000
Unrecognized Tax Benefits, Interest on Income Taxes Expense	66,000	48,000	41,000
Unrecognized Tax Benefits, Income Tax Penalties Expense	$ 27,000	10,000	17,000
Oregon Net Operating Loss, Term	4 years
Deferred Tax Assets, Capital Loss Carryforwards	$ 3,703,000	4,272,000
Deferred Tax Assets, Valuation Allowance	5,556,000	6,150,000
Unrecognized Tax Benefits	657,000	421,000
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	268,000	244,000
Unrecognized Tax Benefits, Income Tax Penalties Accrued	194,000	142,000
Reserve for Unrecognized Tax Benefits, Including Penalties and Interest	1,119,000	807,000
Atlas Lighting Products, Inc. [Member]
Unrecognized Tax Benefits, Increase Resulting from Acquisition	483,000
Unrecognized Tax Benefits	314,000
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	79,000
Unrecognized Tax Benefits, Income Tax Penalties Accrued	90,000
Domestic Tax Authority [Member]
Deferred Tax Assets, Capital Loss Carryforwards	406,000	456,000
State and Local Jurisdiction [Member] | New York State Division of Taxation and Finance [Member]
Deferred State and Local Income Tax Expense (Benefit)	0
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
State and Local Jurisdiction [Member] | Oregon State Tax [Member]
Deferred Tax Assets, Research and Development Credit, Expired During Period	25,000	11,000
Deferred Tax Assets, Operating Loss Carryforwards, State and Local	$ 137,000	$ 162,000
Foreign Tax Authority [Member] | Canada Revenue Agency [Member]
Deferred Tax Assets, Operating Loss Carryforwards, Foreign			$ 4,272,000