Note 7 - Goodwill and Intangible Assets (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Impairment of Intangible Assets (Excluding Goodwill), Total	$ 0	$ 0
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year	1,000
Finite-Lived Intangible Assets, Amortization Expense, Year Two	1,000
Finite-Lived Intangible Assets, Amortization Expense, Year Three	1,000
Finite-Lived Intangible Assets, Amortization Expense, Year Four	1,000
Finite-Lived Intangible Assets, Amortization Expense, Year Five	$ 1,000
Customer Relationships [Member]
Finite-Lived Intangible Asset, Useful Life	15 years
Finite-Lived Intangible Assets, Remaining Amortization Period	15 years