Note 9 - Defined Benefit Plans (Details) - Net Periodic Benefit Costs (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Pension Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 0	$ 0	$ 0
Interest cost	18	18	36	36
Expected return on plan assets	(22)	(18)	(45)	(36)
Amortization of transition (asset) obligation	0	0	0	0
Amortization of prior service cost	0	0	0	0
Recognized net actuarial loss	8	7	16	14
Net periodic benefit cost	4	7	7	14
Other Postretirement Benefit Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	11	23	21	46
Interest cost	14	21	28	41
Expected return on plan assets	0	0	0	0
Amortization of transition (asset) obligation	0	9	0	18
Amortization of prior service cost	(8)	3	(16)	7
Recognized net actuarial loss	0	0	0	0
Net periodic benefit cost	$ 17	$ 56	$ 33	$ 112