Note 12 - Medical and Life Insurance Benefits - Retired Employees (Details) - Post Retirement Medical and Life Insurance Plan [Member] - USD ($) $ in Thousands	12 Months Ended
Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Change in Benefit Obligations [Member]
Benefit obligation at beginning of year	$ 6,611	$ 5,867	$ 10,964
Service cost	105	113	225
Interest cost	287	244	396
Plan amendments			(5,730)
Benefits paid	(772)	(647)	(429)
Actuarial (gain) loss	1,150	1,034	441
Benefit obligation at end of year	7,381	6,611	5,867
Change in Plan Assets [Member]
Benefits paid	(772)	(647)	(429)
Fair value of plan assets at beginning of year
Employer contributions	772	647	429
Fair value of plan assets at end of year
Amounts Recongnized in Balance Sheet [Member]
Current liability	(396)	(441)	(379)
Noncurrent liability	(6,985)	(6,170)	(5,488)
Net amount recognized in balance sheet	(7,381)	(6,611)	(5,867)
Components of Net Periodic Benefit Cost [Member]
Service cost	105	113	225
Interest cost	287	244	396
Amortization of prior service cost	(781)	(799)	(771)
Recognized actuarial loss	15		(1)
Net periodic benefit cost	$ (374)	$ (442)	$ (151)
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	3.77%	4.49%	4.29%
Rate of compensation increase	2.64%	2.64%	2.64%
Net amount recognized in balance sheet	$ (7,381)	$ (6,611)	$ (5,867)
Discount rate	4.49%	4.29%	4.96%
Rate of compensation increase	2.64%	2.64%	2.64%
Prior service credit	$ 4,523	$ 5,305	$ 6,104
Accumulated loss	(1,983)	(850)	185
Amounts not yet recognized as a component of net periodic benefit cost	2,540	4,455	6,289
Accumulated net periodic benefit cost in excess of contributions	(9,921)	(11,066)	(12,156)
Prior service credit	673	781	799
Recognized actuarial loss	(120)	(15)
	$ 553	$ 766	$ 799
Healthcare cost trend rate assumed for next year	6.90%	8.00%	8.30%
Rate to which the cost trend rate gradually declines	4.50%	4.50%	4.50%
Year that the rate reaches the rate at which it is assumed to remain	2027	2027	2026

Represents the accumulated net periodic benefit cost in excess of contributions.

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The pretax total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

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The pretax net amount of gains and losses that are not yet recognized as a component of net periodic benefit cost, and that are recognized as increases or decreases in other comprehensive income as they arise. Gains and losses are due to changes in the value of either the benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan.

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Amount related to the pretax cost of benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation, which has not yet been recognized as components of net periodic benefit cost.

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Amount of gain (loss) related to change in benefit obligation resulting from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover, salary, and temporary deviation from the substantive plan.

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The amount of gains or losses recognized in net periodic benefit cost.

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The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation.

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Amount included in accumulated other comprehensive income (AOCI) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position, including gain (loss), prior service cost (credit), and transition asset (obligation).

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The aggregate net amount recognized in the balance sheet associated with the defined benefit plan(s). Will normally be the same as the Defined Benefit Plan, Funded Status of Plan, Total.

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The interest rate used to adjust for the time value of money for the plan.

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Expected rate of compensation increases (for pay-related plans).

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The interest rate used to adjust for the time value of money.

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Expected rate of compensation increases (for pay-related plans).

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1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date.

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The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets.

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Amount of contributions made by the employer to defined benefit plans.

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Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees.

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Amount included in accumulated other comprehensive income (AOCI) related to gain (loss) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position.

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No definition available.

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Amount included in accumulated other comprehensive income (AOCI) related to prior service cost (credit) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position.

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No definition available.

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The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status.

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The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

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The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments.

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The amount of increase or decrease due to a change in the terms of an existing plan or the initiation of a new plan. A plan amendment may increase or decrease benefits, including those attributed to years of service already rendered.

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The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

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The ultimate trend rate for health care costs.

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Year the ultimate health care cost trend rate is expected to be reached, in CCYY format.

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For a classified balance sheet, the amount recognized in balance sheet as a current liability associated with an underfunded defined benefit plan.

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This represents the noncurrent liability for underfunded plans recognized in the balance sheet that is associated with the defined benefit pension plans and other postretirement defined benefit plans.

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