Subsequent Events (Details Narrative) - Subsequent Event [Member]	Apr. 06, 2018 USD ($) ft² a	Apr. 02, 2018 $ / shares
B. Braun Medical Inc. [Member] | Industrial Building [Member]
Subsequent Event [Line Items]
Purchase of industrial building | ft²	399,440
Area of property | a	27.5
Percentage of building area leased	100.00%
Lease term	10 years
Lease term expiration period	Apr. 01, 2028
Purchase price of industrial building	$ 30,750,540
Mortgage loan amortization period	15 years
Face amount of mortgages	$ 19,500,000
Mortgage loans on real estate, interest rate	4.25%
Annual rental income over the remaining term of lease	$ 2,128,000
Common Shareholders [Member ]
Subsequent Event [Line Items]
Dividend declared per share | $ / shares		$ 0.17
Dividend declaration date		Apr. 02, 2018
Dividends payable, date to be paid		Jun. 15, 2018
Dividend payable date of record		May 15, 2018
Series C Preferred Shareholders [Member]
Subsequent Event [Line Items]
Dividend declared per share | $ / shares		$ 0.3828125
Dividend declaration date		Apr. 02, 2018
Dividends payable, date to be paid		Jun. 15, 2018
Dividend payable date of record		May 15, 2018
Preferred stock dividend rate, percentage		6.125%