Note 10 - Components of Company's Deferred Tax Assets and Liabilities for Federal and State Income Taxes (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Jun. 30, 2015
Deferred tax assets:
Net operating loss carryforwards	$ 41,023	$ 38,317
Income tax credit carryforwards	2,367	2,143
Stock compensation	874	916
Other	1,345	1,479
Valuation allowance	(45,892)	(42,408)
Total deferred taxes	(283)	447
Deferred tax liabilities
Depreciation and amortization	(7,358)	(8,088)
Net deferred taxes and liabilities	$ (7,641)	$ (7,641)