Note 9 - Debt and Other Financing Arrangements (Details Textual) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)
Long-term Debt, Weighted Average Interest Rate, over Time	3.80%	3.60%
Interest Expense, Total	$ 28	$ 56
Debt Instrument, Interest Rate, Effective Percentage	3.90%	3.90%
Long-term Debt, Total	$ 2,899	$ 2,899