Note 8 - Employee Benefit Plans (Details) - Investment Policy Allocation	12 Months Ended
	Dec. 31, 2013
Large Cap U.S. Equity [Member]
Note 8 - Employee Benefit Plans (Details) - Investment Policy Allocation [Line Items]
Target plan asset allocations	10.00%
Target plan asset allocations, minimum	7.00%
Target plan asset allocations, maximum	13.00%
Small Cap U.S. Equity [Member]
Note 8 - Employee Benefit Plans (Details) - Investment Policy Allocation [Line Items]
Target plan asset allocations	5.00%
Target plan asset allocations, minimum	4.00%
Target plan asset allocations, maximum	6.00%
Foreign Government Debt Securities [Member]
Note 8 - Employee Benefit Plans (Details) - Investment Policy Allocation [Line Items]
Target plan asset allocations	10.00%
Target plan asset allocations, minimum	8.00%
Target plan asset allocations, maximum	12.00%
Fixed Income Funds [Member]
Note 8 - Employee Benefit Plans (Details) - Investment Policy Allocation [Line Items]
Target plan asset allocations	35.00%
Target plan asset allocations, minimum	29.00%
Target plan asset allocations, maximum	43.00%
Real Estate [Member]
Note 8 - Employee Benefit Plans (Details) - Investment Policy Allocation [Line Items]
Target plan asset allocations	15.00%
Target plan asset allocations, minimum	12.00%
Target plan asset allocations, maximum	18.00%
Hedge Funds [Member]
Note 8 - Employee Benefit Plans (Details) - Investment Policy Allocation [Line Items]
Target plan asset allocations	15.00%
Target plan asset allocations, minimum	12.00%
Target plan asset allocations, maximum	18.00%
Real Return [Member]
Note 8 - Employee Benefit Plans (Details) - Investment Policy Allocation [Line Items]
Target plan asset allocations	10.00%
Target plan asset allocations, minimum	8.00%
Target plan asset allocations, maximum	12.00%