Note 19 - Accumulated Other Comprehensive Income (Loss) - Significant Amounts Reclassified Out of Each Component of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Income tax benefit	$ 633	$ 2,114
Net income	4,211	4,277
Prior service costs	(252)	(239)
Actuarial gains	(85)	(71)
Net income before income taxes	4,844	6,391
Other than temporary impairment losses		508
Reclassification out of Accumulated Other Comprehensive Income [Member]
Net income	206	219
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Unrealized gains and losses on available-for-sale securities	9	(346)
Income tax benefit	(2)	(55)
Net income	7	107
Other than temporary impairment losses		508
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]
Income tax benefit	(53)	(127)
Net income	199	112
Prior service costs
Actuarial gains	252	239
Net income before income taxes	$ 252	$ 239