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		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Amortization of defined benefit plan pension items:
Amortization of (income) loss	$ (13)	$ 153	$ 169	$ 461
Income tax effect	4	(63)	(48)	(189)
After tax	(9)	90	121	272
Amortization of (gain) loss on interest rate swap:
Reclassification to interest expense	(136)	33	(258)	82
Income tax effect	39	(14)	74	(34)
After tax	(97)	19	(184)	48
Total reclassifications, net of income tax	$ (106)	$ 109	$ (63)	$ 320