Note 10 - Pension and Other Postretirement Benefits (Details) - Plans Weighted-Average Allocations by Asset Category	12 Months Ended
	Dec. 31, 2013
Equities [Member] | U.S. Plan [Member]
Note 10 - Pension and Other Postretirement Benefits (Details) - Plans Weighted-Average Allocations by Asset Category [Line Items]
Weighted-average allocations by asset category	51.00%
Equities [Member] | Canadian Plan [Member]
Note 10 - Pension and Other Postretirement Benefits (Details) - Plans Weighted-Average Allocations by Asset Category [Line Items]
Weighted-average allocations by asset category	41.00%
Fixed Income Securities [Member] | U.S. Plan [Member]
Note 10 - Pension and Other Postretirement Benefits (Details) - Plans Weighted-Average Allocations by Asset Category [Line Items]
Weighted-average allocations by asset category	49.00%
Fixed Income Securities [Member] | Canadian Plan [Member]
Note 10 - Pension and Other Postretirement Benefits (Details) - Plans Weighted-Average Allocations by Asset Category [Line Items]
Weighted-average allocations by asset category	59.00%
U.S. Plan [Member]
Note 10 - Pension and Other Postretirement Benefits (Details) - Plans Weighted-Average Allocations by Asset Category [Line Items]
Weighted-average allocations by asset category	100.00%
Canadian Plan [Member]
Note 10 - Pension and Other Postretirement Benefits (Details) - Plans Weighted-Average Allocations by Asset Category [Line Items]
Weighted-average allocations by asset category	100.00%