Note 11 - Accumulated Other Comprehensive Loss - Summary of Reclassifications from Accumulated Other Comprehensive Loss to Net Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Amortization of defined benefit plan pension items:
Amortization of loss	$ 121	$ 91
Income tax effect	(34)	(26)
After tax	87	65
Amortization of gain on interest rate swap:
Reclassification to interest expense	(227)	(25)
Income tax effect	64	7
After tax	(163)	(18)
Total reclassifications, net of income tax	$ (76)	$ 47