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Note 2 - Recent Accounting Pronouncements (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2016
Increase in Net Income That Would Have Resulted if ASU 2016-01 Had Been Early Adopted [Member] | Pro Forma [Member]    
Current Period Reclassification Adjustment $ 15,000 $ 41,000