Note 9 - Accumulated Other Comprehensive Loss - Summary of Reclassifications from Accumulated Other Comprehensive Loss to Net Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Amortization of defined benefit plan pension items:
Amortization of loss	$ 91	$ 154	$ 182	$ 308
Income tax effect	(26)	(63)	(52)	(126)
After tax	65	91	130	182
Amortization of loss on interest rate swap:
Reclassification to interest expense	(97)	24	(122)	49
Income tax effect	28	(10)	35	(20)
After tax	(69)	14	(87)	29
Total reclassifications, net of income tax	$ (4)	$ 105	$ 43	$ 211