Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Equity - Narrative (Details)

Shareholders' Equity - Narrative (Details) - USD ($)		1 Months Ended	3 Months Ended		6 Months Ended		124 Months Ended
Shareholders' Equity - Narrative (Details) - USD ($)	May 12, 2017	Jul. 31, 2017	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	May 22, 2017	Dec. 31, 2016	Nov. 30, 2016	May 18, 2016	May 17, 2016	Nov. 30, 2014	Oct. 31, 2011	Mar. 31, 2007
Capital Unit [Line Items]
Shares authorized for repurchase (in shares) (up to)										10,000,000			10,000,000		2,500,000
Shares authorized for additional repurchase (in shares)														5,000,000
Repurchase and retirement of common stock (in shares)			782,874		897,874		18,397,874
Repurchase and retirement of common stock					$ 2,581,000		$ 46,887,000
Shares repurchased, value			$ 1,916,000		$ 2,196,000
Shares available for purchase (in shares)			9,102,126		9,102,126		9,102,126
Payment to option holder	$ 850,000
Non-cash compensation expense			$ 1,378,000	$ 1,341,000	$ 2,807,000	$ 2,696,000
Shares surrendered for tax withholdings (in shares)					145,920
Preferred stock, shares authorized (in shares)			50,000,000		50,000,000		50,000,000		50,000,000		50,000,000	25,000,000
Common stock, shares authorized (in shares)			1,000,000,000		1,000,000,000		1,000,000,000		1,000,000,000		1,000,000,000	800,000,000
Issuance of Series A preferred stock					$ 9,483,000	$ 8,777,000
Series A Preferred Stock
Capital Unit [Line Items]
Preferred stock, shares authorized (in shares)			23,844,916		23,844,916		23,844,916	6,554,916	17,290,000
Preferred shares sold in period			398,259		398,259
Issuance of Series A preferred stock			$ 9,911,000
Commission paid			401,000		$ 428,000
Dividends paid			7,953,000		$ 15,877,000
Dividends paid per share on monthly basis (in USD per share)					$ 0.1667
Employees
Capital Unit [Line Items]
Non-cash compensation expense					$ 2,784,000
Options
Capital Unit [Line Items]
Unrecognized compensation cost for stock based compensation			$ 2,790,000		$ 2,790,000		$ 2,790,000
Unrecognized compensation cost for stock based compensation, period of recognition					1 year 6 months 12 days
Options voluntarily canceled and terminated	3,000,000
Exercise price per share	$ 1.91
Purchase of shares (in shares)			1,569,901		1,740,997.000
Intrinsic value of options exercised			$ 453,000		$ 559,000
Restricted shares
Capital Unit [Line Items]
Unrecognized compensation cost for stock based compensation			$ 7,308,000		$ 7,308,000		7,308,000
Unrecognized compensation cost for stock based compensation, period of recognition					2 years 8 months 12 days
Restricted stock forfeited (in shares)			0		0
Restricted shares \| Employees
Capital Unit [Line Items]
Non-cash compensation expense			$ 1,366,000		$ 2,784,000
Restricted shares \| Consultants and Independent Financial Advisors
Capital Unit [Line Items]
Non-cash compensation expense			12,000		23,000
Restricted shares \| Awards Granted in 2017
Capital Unit [Line Items]
Unrecognized compensation cost for stock based compensation			$ 3,658,000		$ 3,658,000		$ 3,658,000
Unrecognized compensation cost for stock based compensation, period of recognition					3 years 3 months 29 days
Options, Warrants, and Other
Capital Unit [Line Items]
Shares surrendered for tax withholdings (in shares)			25,351		165,578
Subsequent Event \| Series A Preferred Stock
Capital Unit [Line Items]
Preferred shares sold in period		12,310
Issuance of Series A preferred stock		$ 305,000
Commission paid		$ 6,000