Note 12 - Accumulated Other Comprehensive (Loss) Income - Summary of Reclassifications from Accumulated Other Comprehensive Loss to Net (Loss) Income (Details) - USD ($) $ in Thousands		3 Months Ended				9 Months Ended		12 Months Ended
		Sep. 30, 2017		Sep. 30, 2016		Sep. 30, 2017		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Amortization of defined benefit plan pension items: (1)
Amortization of defined benefit plan loss		$ 615	[1],[2]	$ 662	[1],[2]	$ 936	[1],[2]	$ 615	$ 662	$ 936
Income tax effect		(252)	[2]	(272)	[2]	(382)	[2]	(252)	(272)	(382)
After tax	[2]	363		390		554
Amortization of loss on interest rate swap: (3)
Reclassification of loss on interest rate swaps		104	[3]	106	[3]	1,970	[3]	104	106	1,970
Income tax effect		(43)	[3]	(44)	[3]	(810)	[3]	$ (43)	$ (44)	$ (810)
After tax	[3]	61		62		1,160
Total reclassifications net of income tax	[3]	$ 424		$ 452		$ 1,714

[1] Included in "Selling, general and administrative expense" on the Company's Consolidated Statements of Comprehensive (Loss) Income.

[2] See Note 13 "Retirement Plans" for additional information regarding the Company's pension plans.

[3] See Note 7 "Fair Value Measurements" for additional information regarding the Company's interest rate swaps.