Note 8 - Income Taxes (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent			35.00%	35.00%
Effective Income Tax Rate Reconciliation, Percent	41.00%	38.60%	46.50%	39.10%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Percent			5.50%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent			4.70%	4.90%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent			1.70%	0.60%
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent			0.40%	1.40%