Summarized Consolidated Quarterly Information - Summarized Consolidated and Condensed Quarterly Financial Information (Detail) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Total revenue	$ 11,554,000	$ 11,537,000	$ 11,615,000	$ 12,824,000	$ 14,206,000	$ 12,137,000	$ 13,416,000	$ 11,131,000	$ 47,529,755	$ 50,890,438	$ 41,335,155
Income from continuing operations	(230,000)	466,000	941,000	1,604,000	2,342,000	1,508,000	2,928,000	1,293,000	2,780,642	8,070,983	4,616,385
Net income	$ (230,000)	$ 466,000	$ 941,000	$ 1,604,000	$ 3,372,000	$ 1,644,000	$ 4,067,000	$ 1,222,000	$ 2,780,642	$ 10,304,983	$ 4,047,122
Per share amounts - basic:
Income from continuing operations	$ (0.02)	$ 0.04	$ 0.08	$ 0.14	$ 0.21	$ 0.13	$ 0.26	$ 0.12	$ 0.25	$ 0.72	$ 0.42
Net income	(0.02)	0.04	0.08	0.14	0.30	0.15	0.36	0.11	0.25	0.92	0.37
Per share amounts - diluted:
Income from continuing operations	(0.02)	0.04	0.08	0.14	0.20	0.13	0.25	0.11	0.24	0.69	0.39
Net income	$ (0.02)	$ 0.04	$ 0.08	$ 0.14	$ 0.29	$ 0.14	$ 0.35	$ 0.10	$ 0.24	$ 0.88	$ 0.34
Weighted average number of common shares outstanding:
Total revenue	$ 11,554,000	$ 11,537,000	$ 11,615,000	$ 12,824,000	$ 14,206,000	$ 12,137,000	$ 13,416,000	$ 11,131,000	$ 47,529,755	$ 50,890,438	$ 41,335,155
Income from continuing operations	(230,000)	466,000	941,000	1,604,000	2,342,000	1,508,000	2,928,000	1,293,000	2,780,642	8,070,983	4,616,385
Net income	$ (230,000)	$ 466,000	$ 941,000	$ 1,604,000	$ 3,372,000	$ 1,644,000	$ 4,067,000	$ 1,222,000	$ 2,780,642	$ 10,304,983	$ 4,047,122
Basic	11,294,000	11,321,000	11,322,000	11,284,000	11,251,000	11,236,000	11,229,000	11,191,000	11,305,110	11,226,932	11,086,690
Diluted	11,294,000	11,764,000	11,781,000	11,726,000	11,744,000	11,721,000	11,690,000	11,693,000	11,745,516	11,706,495	11,593,079