Note 4 - Goodwill and Other Intangible Assets (Details Textual) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Amortization of Intangible Assets $ 0.2 $ 0.2 $ 0.5 $ 0.6