Note 12 - Accumulated Other Comprehensive Loss - Summary of Activity in Accumulated Other Comprehensive (Loss) Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Balance, beginning	$ 154,510	$ 158,876
Reclassifications from accumulated comprehensive loss to net loss	(155)	424
Balance, ending	169,750	154,510
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balance, beginning	(2,765)	(2,875)
Other comprehensive income before reclassifications	(399)	237
Reclassifications from accumulated comprehensive loss to net loss	161	363
Net other comprehensive income	(238)	600
Reclassifications from accumulated comprehensive loss to accumulated deficit		(490)
Balance, ending	(3,003)	(2,765)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Interest Rate Swap [Member]
Balance, beginning	369	(35)
Other comprehensive income before reclassifications	275	278
Reclassifications from accumulated comprehensive loss to net loss	(316)	61
Net other comprehensive income	(41)	339
Reclassifications from accumulated comprehensive loss to accumulated deficit		65
Balance, ending	328	369
AOCI Attributable to Parent [Member]
Balance, beginning	(2,396)	(2,910)
Other comprehensive income before reclassifications	(124)	515
Reclassifications from accumulated comprehensive loss to net loss	(155)	424
Net other comprehensive income	(279)	939
Reclassifications from accumulated comprehensive loss to accumulated deficit		(425)
Balance, ending	$ (2,675)	$ (2,396)