Note 3 - Income Taxes (Details Textual) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Effective Income Tax Rate Reconciliation, Percent	35.20%	35.70%	33.10%	37.70%
Increase (Decrease) in Income Tax Expense Accounting Change	$ (77,000)		$ (409,000)
Increase (Decrease) in Effective Tax Rate from Capital Loss Valuation Allowance Write Off			(300,000)
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority	(48,000)		(48,000)
Unrecognized Tax Benefits, Excluding Interest and Penalties	373,000		373,000
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	3,000		3,000
Unrecognized Tax Benefits, Income Tax Penalties Accrued	7,000		7,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	91,000		91,000
Unrecognized Tax Benefits that Would Not Impact Effective Tax Rate	$ 282,000		$ 282,000