Aggregate dividends declared during the period for each share of common stock outstanding.

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Date the declared dividend will be paid, in CCYY-MM-DD format.

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Date the dividend to be paid was declared, in CCYY-MM-DD format.

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Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format.

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Amount of increase (decrease) of the credit facility.

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Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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SUBSEQUENT EVENTS (Detail Textuals) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended												12 Months Ended
	Mar. 04, 2019	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, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Subsequent Event [Line Items]
Cash dividend declared per share (in dollars per share)		$ 0.18	$ 0.18	$ 0.18	$ 0.18	$ 0.18	$ 0.18	$ 0.18	$ 0.18					$ 0.72	$ 0.72	$ 0.68
Dividends payable, payment date		Dec. 10, 2018	Sep. 17, 2018	Jun. 18, 2018	Mar. 26, 2018	Dec. 11, 2017	Sep. 18, 2017	Jun. 20, 2017	Apr. 03, 2017	Dec. 12, 2016	Sep. 19, 2016	Jun. 20, 2016	Mar. 28, 2016
Dividends payable, record date		Dec. 03, 2018	Sep. 10, 2018	Jun. 11, 2018	Mar. 19, 2018	Dec. 04, 2017	Sep. 11, 2017	Jun. 13, 2017	Mar. 27, 2017	Dec. 05, 2016	Sep. 12, 2016	Jun. 13, 2016	Mar. 21, 2016
Proceeds from Lines of Credit														$ 5,000	$ 5,000	$ 5,000
Credit facility
Subsequent Event [Line Items]
Proceeds from Lines of Credit					$ 5,000
Subsequent event
Subsequent Event [Line Items]
Cash dividend declared per share (in dollars per share)	$ 0.18
Dividends payable, declared date	Mar. 04, 2019
Dividends payable, payment date	Mar. 25, 2019
Dividends payable, record date	Mar. 18, 2019
Subsequent event \| Credit facility
Subsequent Event [Line Items]
Increased balance after additional borrowings on credit facility	$ 20,000