Note 6 - Pension and Post-retirement Benefits (Tables)

9 Months Ended

Mar. 31, 2016

Post Retirement Medical and Life Insurance Plan [Member]

Notes Tables

Schedule of Net Benefit Costs [Table Text Block]

	Three Months Ended						Nine Months Ended
	3/31/2016 (Unaudited)			3/31/2015 (Unaudited)			3/31/2016 (Unaudited)			3/31/2015 (Unaudited)
Service cost	$	26		$	29		$	79		$	85
Interest cost		71			61			215			183
Amortization of prior service credit		(195	)		(200	)		(586	)		(599	)
Amortization of net loss		4			-			11			-
	$	(94	)	$	(110	)	$	(281	)	$	(331	)

Schedule of Net Benefit Costs [Table Text Block]

	Three Months Ended						Nine Months Ended
	3/31/2016 (Unaudited)			3/31/2015 (Unaudited)			3/31/2016 (Unaudited)			3/31/2015 (Unaudited)
Service cost	$	714		$	694		$	2,143		$	2,081
Interest cost		1,732			1,673			5,259			5,085
Expected return on plan assets		(1,560	)		(1,724	)		(4,739	)		(5,236	)
Amortization of net loss		13			7			39			23
	$	899		$	650		$	2,702		$	1,953