Note 8 - Income Taxes (Details Textual) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2015	Sep. 30, 2014
Foreign Tax Authority [Member] | Earliest Tax Year [Member]
Open Tax Year		2008
Foreign Tax Authority [Member] | Latest Tax Year [Member]
Open Tax Year		2014
Domestic Tax Authority [Member] | Earliest Tax Year [Member] | Internal Revenue Service (IRS) [Member]
Open Tax Year		2008
Domestic Tax Authority [Member] | Latest Tax Year [Member] | Internal Revenue Service (IRS) [Member]
Open Tax Year		2014
State and Local Jurisdiction [Member] | Earliest Tax Year [Member]
Open Tax Year		2008
State and Local Jurisdiction [Member] | Latest Tax Year [Member]
Open Tax Year		2014
Deferred Tax Liabilities, Other	$ 0	$ 0
Effective Income Tax Rate Reconciliation, Percent	38.50%	39.10%
Unrecognized Tax Benefits	$ 500,000	$ 500,000	$ 700,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	400,000	400,000
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit	$ (200,000)	$ (200,000)