CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net income	$ 541	$ 1,898
Other comprehensive income items:
Actuarial gains	19
Income tax expense on actuarial gain	(4)
Other comprehensive loss:
Retirement benefits adjustment, net of income taxes	15
Total comprehensive income	$ 556	$ 1,898