Note 19 - Accumulated Other Comprehensive Income (Loss) - Changes in Accumulated Other Comprehensive Income (Loss) by Component, Net of Tax (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Balance	$ 59,091	$ 54,073
Total other comprehensive loss	(652)	(164)
Reclassification of disproportionate tax effects
Balance	80,008	59,091
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Balance	(679)	(679)
Other comprehensive income before reclassification	(658)	5
Amounts reclassified from accumulated other comprehensive income (loss)	7	107
Total other comprehensive loss	(651)	112
Cumulative effect of adoption of ASU 2016-01	(187)
Reclassification of disproportionate tax effects		(112)
Balance	(1,517)	(679)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balance	(4,839)	(3,812)
Other comprehensive income before reclassification	(200)	(388)
Amounts reclassified from accumulated other comprehensive income (loss)	199	112
Total other comprehensive loss	(1)	(276)
Cumulative effect of adoption of ASU 2016-01
Reclassification of disproportionate tax effects		(751)
Balance	(4,840)	(4,839)
AOCI Attributable to Parent [Member]
Balance	(5,518)	(4,491)
Other comprehensive income before reclassification	(858)	(383)
Amounts reclassified from accumulated other comprehensive income (loss)	206	219
Total other comprehensive loss	(652)	(164)
Cumulative effect of adoption of ASU 2016-01	(187)
Reclassification of disproportionate tax effects		(863)
Balance	$ (6,357)	$ (5,518)