Note 7 - Income Taxes (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Income Tax Expense (Benefit), Total	$ (1,020)	$ 354
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	(1,898)	(590)
Liability for Uncertainty in Income Taxes, Current	0	0
Income Tax Examination, Penalties and Interest Accrued, Total	0	0
Deferred Tax Assets Related to Net Operating Loss [Member]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	(1,898)	$ (455)
Capital Loss Carryforward [Member]
Tax Credit Carryforward, Amount	1,229
Capital Loss Carryforward [Member] | Tax Year 2020 [Member]
Tax Credit Carryforward, Amount	77
Capital Loss Carryforward [Member] | Tax Year 2025 [Member]
Tax Credit Carryforward, Amount	1,152
Domestic Tax Authority [Member]
Operating Loss Carryforwards, Total	30,019
State and Local Jurisdiction [Member]
Operating Loss Carryforwards, Total	$ 7,845
State and Local Jurisdiction [Member] | New Jersey Division of Taxation [Member]
Income Tax Examination, Year under Examination		2014 2015 2016 2017