Note 4 - Income Taxes (Details Textual) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Effective Income Tax Rate Reconciliation, Percent	36.20%	35.90%	37.20%	35.30%
Unrecognized Tax Benefits, Excluding Interest and Penalties	$ 394,000		$ 394,000
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	9,000		9,000
Unrecognized Tax Benefits, Income Tax Penalties Accrued	7,000		7,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	207,000		207,000
Unrecognized Tax Benefits that Would Not Impact Effective Tax Rate	$ 187,000		$ 187,000