Summary of Significant Accounting Policies, Net Income Per Share (Details) - USD ($)	3 Months Ended								12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Reconciliation of basic and diluted net income per share [Abstract]
Net income	$ 9,812,000	$ 11,110,000	$ 9,143,000	$ 7,508,000	$ 2,297,000	$ 7,748,000	$ (1,392,000)	$ 1,910,000	$ 37,573,000	$ 10,563,000	$ 11,453,000
Basic shares (in shares)									18,608,812	18,233,163	16,734,539
Effect of dilutive stock options and warrants (in shares)									809,894	832,930	871,401
Diluted shares (in shares)									19,418,706	19,066,093	17,605,940
Net income per share [Abstract]
Basic net income per share (in dollars per share)	$ 0.53	$ 0.59	$ 0.49	$ 0.40	$ 0.12	$ 0.42	$ (0.08)	$ 0.11	$ 2.02	$ 0.58	$ 0.68
Diluted net income per share (in dollars per share)	0.50	$ 0.57	$ 0.47	$ 0.39	0.12	$ 0.41	$ (0.08)	$ 0.10	$ 1.93	$ 0.55	$ 0.65
Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from effect of dilutive options and warrants (in shares)									293,239	1,100	0
Exercise price (in dollars per share)					$ 34.17					$ 34.17
Options [Member] | Minimum [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Exercise price (in dollars per share)	28.68								$ 28.68
Options [Member] | Maximum [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Exercise price (in dollars per share)	$ 34.17								$ 34.17
Warrants [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from effect of dilutive options and warrants (in shares)											0