Note 6 - Goodwill and Intangible Assets (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets, Amortization Expense, Year Five	$ 206,000
Finite-Lived Intangible Assets, Amortization Expense, after Year Five	220,000
Amortization of Intangible Assets	995,000	$ 876,000	$ 954,000
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	570,000
Finite-Lived Intangible Assets, Amortization Expense, Year Two	505,000
Finite-Lived Intangible Assets, Amortization Expense, Year Three	495,000
Finite-Lived Intangible Assets, Amortization Expense, Year Four	$ 206,000