Note 12 - Employee Benefit and Retirement Plans (Details) - Medical and Life Insurance Benefits - Retired Employees (Postretirement Medical and Life Insurance Plan [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2012
Estimated amounts that will be amortized from accumulated other comprehensive loss over the next year
Prior service credit	$ 799	$ 502	$ 905
Net gain (loss)	0		(158)
	799	502	747
Healthcare cost trend rate assumed for next year	8.30%	7.80%	8.80%
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	2026	2026	2026
Discount rate	4.29%	4.96%	3.92%
Rate of compensation increase	2.64%	2.64%	2.64%
Change in plan assets
Net amount recognized in balance sheet	(5,867)	(10,964)	(14,230)
Weighted average assumptions – net periodic benefit cost
Discount rate	4.96%	3.92%	5.44%
Rate of compensation increase	2.64%	2.64%	2.64%
Amounts not yet reflected in net periodic benefit cost and included in accumulated other comprehensive loss
Prior service credit	6,104	1,145	1,888
Accumulated gain (loss)	185	627	(3,400)
Amounts not yet recognized as a component of net periodic benefit cost	6,289	1,772	(1,512)
Net periodic benefit cost in excess of accumulated contributions	(12,156)	(12,736)	(12,718)
Net amount recognized	(5,867)	(10,964)	(14,230)
Change in Benefit Obligations [Member]
Note 12 - Employee Benefit and Retirement Plans (Details) - Medical and Life Insurance Benefits - Retired Employees [Line Items]
Benefit obligation at beginning of year	10,964	14,230	11,804
Service cost	225	484	386
Interest cost	396	518	611
Estimated amounts that will be amortized from accumulated other comprehensive loss over the next year
Plan amendments	(5,730)
Benefits paid	(429)	(351)	(552)
Actuarial (gain) loss	441	(3,917)	1,981
Benefit obligation at end of year	5,867	10,964	14,230
Change in plan assets
Benefits paid, net of employee contributions	(429)	(351)	(552)
Change in Plan Assets [Member]
Estimated amounts that will be amortized from accumulated other comprehensive loss over the next year
Benefits paid	(429)	(351)	(552)
Change in plan assets
Fair value of plan assets at beginning of year	0	0	0
Employer contributions	429	351	552
Benefits paid, net of employee contributions	(429)	(351)	(552)
Fair value of plan assets at end of year		0	0
Amounts Recongnizedin Balance Sheet [Member]
Change in plan assets
Current postretirement benefit obligation	(379)	(536)	(624)
Non-current postretirement benefit obligation	(5,488)	(10,428)	(13,606)
Net amount recognized in balance sheet	(5,867)	(10,964)	(14,230)
Amounts not yet reflected in net periodic benefit cost and included in accumulated other comprehensive loss
Net amount recognized	(5,867)	(10,964)	(14,230)
Componentsof Net Periodic Benefit Cost [Member]
Note 12 - Employee Benefit and Retirement Plans (Details) - Medical and Life Insurance Benefits - Retired Employees [Line Items]
Service cost	225	484	386
Interest cost	396	518	611
Amortization of prior service credit	(771)	(743)	(905)
Amortization of accumulated loss	(1)	111	2
Net periodic benefit cost	$ (151)	$ 370	$ 94