Note 11 - Income Taxes (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating Loss Carryforwards Expiration Term	20 years
Deferred Tax Assets, Valuation Allowance	$ 1,131	$ 933
Unrecognized Tax Benefits	1,185	400	$ 702	$ 702
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	1,000	300
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	200	100
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit	$ 400
Internal Revenue Service (IRS) [Member] | Earliest Tax Year [Member]
Open Tax Year	2013
Internal Revenue Service (IRS) [Member] | Latest Tax Year [Member]
Open Tax Year	2016
State and Foreign Jurisdictions [Member] | Earliest Tax Year [Member]
Open Tax Year	2012
State and Foreign Jurisdictions [Member] | Latest Tax Year [Member]
Open Tax Year	2016
Foreign Tax Authority [Member]
Operating Loss Carryforwards	$ 4,100	6,900
Tax Credit Carryforward, Amount	2,600
Deferred Tax Assets, Valuation Allowance	1,100	900
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	200
Domestic Tax Authority [Member]
Operating Loss Carryforwards	5,200
Tax Credit Carryforward, Amount	200
State and Local Jurisdiction [Member]
Tax Credit Carryforward, Amount	2,900
Deferred Tax Assets, Tax Credit Carryforwards	$ 1,784	$ 1,339