Note 6 - Goodwill and Intangible Assets (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Amortization of Intangible Assets	$ 654,000	$ 995,000	$ 876,000
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	589,000
Finite-Lived Intangible Assets, Amortization Expense, Year Two	579,000
Finite-Lived Intangible Assets, Amortization Expense, Year Three	290,000
Finite-Lived Intangible Assets, Amortization Expense, Year Four	255,000
Finite-Lived Intangible Assets, Amortization Expense, Year Five	180,000
Finite-Lived Intangible Assets, Amortization Expense, after Year Five	$ 40,000