Note 13 - Accumulated Other Comprehensive Loss - Summary of Activity in Accumulated Other Comprehensive (Loss) Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Total Stockholders' Equity - Beginning Balance	$ 169,750	$ 154,510
Reclassifications from accumulated comprehensive loss to net income	(458)	(155)
Balance at end of period	173,509	169,750
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Total Stockholders' Equity - Beginning Balance	(3,003)	(2,765)
Other comprehensive (loss) income before reclassifications	(115)	(399)
Reclassifications from accumulated comprehensive loss to net income	48	161
Net other comprehensive loss	(67)	(238)
Reclassifications from accumulated comprehensive loss to retained earnings
Net other comprehensive loss	(67)	(238)
Balance at end of period	(3,070)	(3,003)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Interest Rate Swap [Member]
Total Stockholders' Equity - Beginning Balance	328	369
Other comprehensive (loss) income before reclassifications	(29)	275
Reclassifications from accumulated comprehensive loss to net income	(506)	(316)
Net other comprehensive loss	(535)	(41)
Reclassifications from accumulated comprehensive loss to retained earnings
Net other comprehensive loss	(535)	(41)
Balance at end of period	(207)	328
AOCI Attributable to Parent [Member]
Total Stockholders' Equity - Beginning Balance	(2,675)	(2,396)
Other comprehensive (loss) income before reclassifications	(144)	(124)
Reclassifications from accumulated comprehensive loss to net income	(458)	(155)
Net other comprehensive loss	(602)	(279)
Reclassifications from accumulated comprehensive loss to retained earnings
Net other comprehensive loss	(602)	(279)
Balance at end of period	$ (3,277)	$ (2,675)