Note 10 - Recent Accounting Pronouncements (Details Textual) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2016
Reclassification from Current Deferred Tax Assets to Noncurrent Deferred Tax Assets [Member] | December 31, 2015 [Member]
Prior Period Reclassification Adjustment		$ 1,100,000
Reclassification from Excess Tax Benefits to Income Tax Expense [Member] | Period Ended March 31 2016 [Member]
Prior Period Reclassification Adjustment		333,000
Recognition of Excess Tax Benefits in Provision for Income Taxes, Rather than Additional Paid-In Capital [Member]
Current Period Reclassification	$ 38,000	$ 447,000