Note 11 - Income Taxes - Reconciliation of Income Tax Rate (Details)	12 Months Ended
Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Reconciliation to federal statutory rate:
Federal statutory tax rate	34.00%	35.00%	34.00%
State and local taxes, net of federal benefit	2.40%	2.20%	2.40%
Impact of foreign operations			0.70%
Federal and state tax credits	(5.30%)	(2.60%)	(3.70%)
Valuation allowance	(18.90%)		(3.80%)
Domestic production activities deduction	(4.10%)	(4.20%)	(4.00%)
Uncertain tax position activity	(5.50%)	(0.60%)	(1.30%)
Other	0.00%	2.50%	2.10%
Sale of subsidiary			5.00%
Effective tax rate	2.60%	32.30%	31.40%

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to disposition of a business not qualifying as a discontinued operation.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income tax contingencies. Includes, but not limited to, domestic tax contingency, foreign tax contingency, state and local tax contingency, and other contingencies.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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