Note 11 - Income Taxes - Deferred Income Taxes (Liabilities) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jun. 30, 2018
Deferred tax assets (liabilities):
Inventories	$ 1,361	$ 1,214
Employee benefits (other than pension)	840	700
Book reserves	601	504
Federal NOL, various carryforward periods	66	551
State NOL, various carryforward periods	1,224	1,034
Foreign NOL, various carryforward periods	309	148
Foreign tax credit carryforward, expiring 2023 – 2028	7,329	5,563
Pension benefits	10,289	8,881
Retiree medical benefits	1,778	1,622
Depreciation	(17)	(113)
Depreciation	17	113
Intangibles	(630)	(410)
Federal research and development and AMT credit carryforward	786	638
Other	1,446	1,180
Total deferred tax assets	25,382	21,738
Valuation allowance	(6,743)	(4,999)
Net deferred tax asset	$ 18,639	$ 16,739