Note 11 - Income Taxes (Details Textual) - USD ($)	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	27.60%	34.00%	35.00%
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability	$ 3,322,991
Deferred Tax Assets, Capital Loss Carryforwards	$ 2,555,000	$ 3,703,000
Operating Loss Carryforwards, Expiration Period	3 years
Oregon Net Operating Loss, Term	4 years
Deferred Tax Assets, Valuation Allowance, Total	$ 4,749,000	5,556,000
Unrecognized Tax Benefits, Ending Balance	651,000	657,000
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	259,000	268,000
Unrecognized Tax Benefits, Income Tax Penalties Accrued	159,000	194,000
Reserve for Unrecognized Tax Benefits, Including Penalties and Interest	1,069,000	1,119,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	651,000
Liability for Uncertainty in Income Taxes, Current	322,000
Unrecognized Tax Benefits, Period Increase (Decrease), Total	20,000	78,000	$ 26,000
Unrecognized Tax Benefits, Interest on Income Taxes Expense	9,000	66,000	48,000
Unrecognized Tax Benefits, Income Tax Penalties Expense	35,000	27,000	$ 10,000
Atlas Lighting Products, Inc. [Member]
Unrecognized Tax Benefits, Increase Resulting from Acquisition		483,000
Domestic Tax Authority [Member]
Deferred Tax Assets, Capital Loss Carryforwards	232,000	406,000
State and Local Jurisdiction [Member] | Oregon State Tax [Member]
Deferred Tax Assets, Operating Loss Carryforwards, State and Local	108,000	137,000
State and Local Jurisdiction [Member] | New York State Division of Taxation and Finance [Member]
Deferred Tax Assets, Operating Loss Carryforwards, State and Local	2,086,000	1,716,000
Deferred Tax Assets, Valuation Allowance, Total	2,086,000	1,716,000
Foreign Tax Authority [Member] | Canada Revenue Agency [Member]
Deferred Tax Assets, Capital Loss Carryforwards	2,555,000			$ 11,972,000
Deferred Tax Assets, Valuation Allowance, Total	$ 10,780,000
Capital Loss Utilized During Period		$ 1,192,000