Note 9 - Quarterly Results for 2014, 2015 and 2016 (Unaudited) (Details Textual) - Reclassification from APIC to Income Tax Expense [Member]	3 Months Ended
	Dec. 31, 2016 USD ($)
Three Months Ended March 31, 2016 [Member]
Prior Period Reclassification Adjustment	$ 182,000
Three Months Ended June 30, 2016 [Member]
Prior Period Reclassification Adjustment	233,000
Three Months Ended September 30, 2016 [Member]
Prior Period Reclassification Adjustment	$ 61,000