Note 14 - Income Taxes (Details) - Reconciliation Between U.S. Federal Statutory Rate and Effective Rate	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reconciliation Between U.S. Federal Statutory Rate and Effective Rate [Abstract]
Statutory federal income tax rate	35.00%	35.00%	34.00%
State tax expense, net of federal benefit	4.80%	6.40%	5.70%
Permanent items, including nondeductible expenses	(0.20%)	0.90%	0.90%
State investment tax credit	(0.10%)	(0.20%)	(0.20%)
Federal, state and foreign research and development credits	(0.50%)	(1.20%)	(0.40%)
Foreign rate differential	0.10%	2.50%	0.90%
Domestic production deduction	(2.40%)	(3.60%)	(2.30%)
Effective income tax rate	36.70%	39.80%	38.60%