CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY, (Unaudited) - USD ($)	Total	Common Stock [Member]	Additional Paid In Capital [Member]	Retained Earnings [Member]
Balances at Dec. 31, 2014	$ 218,078,000	$ 167,000	$ 217,419,000	$ 492,000
Increase (Decrease) in Stockholders' Equity
Net income	1,071,000	0	0	1,071,000
Cash dividend declared	(38,748,000)	0	(37,185,000)	(1,563,000)
Issuance of common stock pursuant to public offerings, net	83,275,000	62,000	83,213,000	0
Issuance of common shares pursuant to stock based compensation plan	287,000	0	287,000	0
Amortization of stock based compensation	144,000	0	144,000	0
Stock Repurchased and Retired During Period, Value	(10,852,000)	(12,000)	(10,840,000)	0
Balances at Dec. 31, 2015	253,255,000	217,000	253,038,000	0
Increase (Decrease) in Stockholders' Equity
Net income	1,979,000	0	0	1,979,000
Cash dividend declared	(41,388,000)	0	(39,409,000)	(1,979,000)
Issuance of common stock pursuant to public offerings, net	118,328,000	113,000	118,215,000	0
Issuance of common shares pursuant to stock based compensation plan	301,000	0	301,000	0
Amortization of stock based compensation	304,000	0	304,000	0
Balances at Dec. 31, 2016	332,779,000	330,000	332,449,000	0
Increase (Decrease) in Stockholders' Equity
Net income	2,007,000	0	0	2,007,000
Cash dividend declared	70,717,000	0	68,710,000	2,007,000
Issuance of common stock pursuant to public offerings, net	197,607,000	200,000	197,407,000	0
Issuance of common shares pursuant to stock based compensation plan	262,000	1,000	261,000	0
Amortization of stock based compensation	273,000	0	273,000	0
Balances at Dec. 31, 2017	$ 462,211,000	$ 531,000	$ 461,680,000	$ 0