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SELECTED CONSOLIDATED QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Summary of quarterly unaudited consolidated statements of operations information [Abstract]
Operating revenues	$ 19,343	$ 21,924	$ 20,238	$ 18,906	$ 20,187	$ 22,356	$ 20,502	$ 19,190
Operating income	4,501	5,244	5,239	3,971	5,165	5,454	4,990	3,991	$ 18,955	$ 19,600	$ 18,819
Net income applicable to common stock	$ 2,945	$ 3,929	$ 3,926	$ 3,478	$ 3,704	$ 3,942	$ 3,251	$ 3,086	$ 14,278	$ 13,983	$ 12,954
Income per common share [Abstract]
Basic (in dollars per share)	$ 0.32	$ 0.42	$ 0.43	$ 0.38	$ 0.40	$ 0.43	$ 0.35	$ 0.34	$ 1.55	$ 1.52	$ 1.42
Diluted (in dollars per share)	$ 0.32	$ 0.42	$ 0.42	$ 0.37	$ 0.40	$ 0.42	$ 0.35	$ 0.34	$ 1.54	$ 1.51	$ 1.41

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