Note 13 - Recent Accounting Pronouncements (Details Textual)	12 Months Ended
	Dec. 31, 2016 USD ($)
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	$ 460,000