Note 9 - Income Taxes (Details Textual)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent			35.00%	35.00%
Effective Income Tax Rate Reconciliation, Percent	40.20%	40.20%	40.70%	40.50%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent			4.40%	4.50%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent			1.20%	1.60%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Percent			0.50%	0.30%
Effective Income Tax Rate Reconciliation, Tax Contingency, State and Local, Percent			(0.40%)	(0.90%)