Note 6 - Goodwill and Intangible Assets - Future Amortization Expense (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	$ 176
Finite-Lived Intangible Assets, Amortization Expense, Year Two	164
Finite-Lived Intangible Assets, Amortization Expense, Year Three	154
Finite-Lived Intangible Assets, Amortization Expense, Year Four	149
Finite-Lived Intangible Assets, Amortization Expense, Year Five	149
Finite-Lived Intangible Assets, Amortization Expense, after Year Five	631
Total	$ 1,423	$ 481