Annual report pursuant to Section 13 and 15(d)

Quarterly Financial Information - Summary of Quarterly Results of Operations (Detail)

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Quarterly Financial Information - Summary of Quarterly Results of Operations (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Quarterly Financial Information Disclosure [Abstract]                      
Operating revenues $ 16,860 $ 16,190 $ 14,258 $ 14,035 $ 13,790 $ 12,970 $ 12,410 $ 12,100 $ 61,343 $ 51,270 $ 43,976
Operating expenses 9,542 8,639 7,369 7,273 6,971 6,100 6,027 5,797 32,823 24,895 21,270
Other expense (6,984) (7,242) (6,438) (6,329) (6,205) (5,878) (5,529) (5,002) (26,993) (22,614) (16,992)
Net income 334 309 451 433 614 992 854 1,301 1,527 3,761 5,714
Dividends attributable to preferred and senior common stock (1,120) (1,106) (1,092) (1,076) (1,065) (1,053) (1,046) (1,042) (4,394) (4,206) (4,156)
Loss available to common stockholders $ (786) $ (797) $ (641) $ (643) $ (451) $ (61) $ (192) $ 259 $ (2,867) $ (445) $ 1,558
Loss income available to common stockholders - basic & diluted $ (0.05) $ (0.06) $ (0.05) $ (0.06) $ (0.04) $ (0.01) $ (0.02) $ 0.02 $ (0.22) $ (0.04) $ 0.15
Weighted average shares outstanding - basic 14,798,950 14,196,423 12,380,402 11,230,647 10,976,992 10,945,379 10,945,379 10,945,379 13,164,244 10,953,325 10,236,859
Weighted average shares outstanding - diluted 14,798,950 14,196,423 12,380,402 11,230,647 10,976,992 10,945,379 10,945,379 11,006,597 13,164,244 10,953,325 10,288,711