Note 9 - Retirement Plans (Details) - Allocation of Plan Assets	Dec. 31, 2013	Dec. 31, 2012
Asset category:
Weighted-average asset allocation	100.00%	100.00%
Insurance General Account [Member]
Asset category:
Weighted-average asset allocation	32.00%	37.00%
Cash Equivalents [Member]
Asset category:
Weighted-average asset allocation	3.00%	3.00%
Equity Securities [Member]
Asset category:
Weighted-average asset allocation	60.00%	54.00%
Fixed Income Securities [Member]
Asset category:
Weighted-average asset allocation	5.00%	6.00%