Equity (Details) - USD ($)					1 Months Ended		12 Months Ended
	Mar. 06, 2019	Feb. 15, 2019	Jun. 12, 2018	Jun. 08, 2018	Jun. 30, 2018	Jul. 30, 2014	Dec. 31, 2019	Dec. 31, 2018	Mar. 11, 2013
Equity (Textual)
Common stock dividend							$ 8,114,000	$ 7,774,000
Remaining number of shares available for repurchase							6,200,000
Preferred stock dividend declared							$ 1,481,000	1,481,000
Sales of equity of subsidiaries								6,000,000
Purchases of equity of subsidiary							$ (191,000)
Warrants exercise price per share			$ 4.77				$ 7.46	$ 6.51
Warrants expiry term				June 2023			June 2023
Description of sales of shares and warrants			The Company sold to a third-party investor (1) 230,415 treasury shares of the Company’s Class B common stock, at a price of $4.34 per share for an aggregate sales price of $1.0 million, and (2) warrants to purchase an additional 209,644 shares of the Company’s Class B common stock at an exercise price of $4.77 per share for an aggregate exercise price of $1.0 million.
Treasury shares							1,000,000	200,000
Treasury Stock, Value							$ (7,675,000)	$ (1,624,000)
Board of Directors Chairman [Member]
Equity (Textual)
Description of sales of shares and warrants				The Company sold to Howard S. Jonas, the Chairman of the Company’s Board of Directors and a principal owner, (1) 1,152,074 shares of the Company’s Class B common stock, at a price of $4.34 per share for an aggregate sales price of $5.0 million, and (2) warrants to purchase an additional 1,048,218 shares of the Company’s Class B common stock at an exercise price of $4.77 per share for an aggregate exercise price of $5.0 million.
Gogas [Member]
Equity (Textual)
Purchases of equity of subsidiary interest					5.00%
Common stock, Shares					41,667
Gogas [Member] | Maximum [Member]
Equity (Textual)
Ownership acquire interest of company					97.00%
Gogas [Member] | Minimum [Member]
Equity (Textual)
Ownership acquire interest of company					92.00%
Preferred Stock [Member]
Equity (Textual)
Preferred stock dividend rate		$ 0.1594						$ 0.6376
Common stock dividend
Preferred stock dividend declared
Record date of declared dividend		Feb. 06, 2020
Purchases of equity of subsidiary
Dividend Declared [Member]
Equity (Textual)
Common stock dividends declared	$ 0.075
Paid date of declared dividend	Mar. 24, 2020
Record date of declared dividend	Apr. 03, 2020
Dividend Paid [Member]
Equity (Textual)
Common stock dividend							$ 8,100,000	$ 7,400,000
Cash dividend paid							$ 0.30	$ 0.30
Dividend Paid [Member] | Preferred Stock [Member]
Equity (Textual)
Preferred stock dividend rate							$ 0.6376
Preferred stock dividend declared							$ 1,500,000
Class A common stock
Equity (Textual)
Common stock dividend
Preferred stock dividend declared
Cash dividend paid							$ 0.30
Purchases of equity of subsidiary
Common stock, Shares							1,574,000	1,574,000
Class B common stock
Equity (Textual)
Common stock dividend
Number of shares repurchased, shares							48,197	149,000
Number of shares repurchased, value							$ 500,000	$ 900,000
Number of stock authorized to be repurchased							731,869		7,000,000
Preferred stock dividend declared
Cash dividend paid								$ 0.30
Commitment to purchase shares						600,000
Common stock dividends declared	$ 0.075
Commitment to purchase shares price per share						$ 6.82
Purchases of equity of subsidiary
Sale of shares				1,152,074
Sale of shares price per share			$ 4.34	$ 4.34
Amount of aggregate sales price			$ 1,000,000	$ 5,000,000
Warrants to purchase shares			209,644				1,257,862
Warrants exercise price per share							$ 4.77
Amount of warrants aggregate exercise price			$ 1,000,000
Common stock, Shares							25,785,000	25,544,000
Fair value of shares of common stock					$ 200,000
Treasury shares			230,415
Stock repurchase program of an aggregate amount							$ 5,600,000
Class B common stock | Howards Jonas [Member]
Equity (Textual)
Commitment to purchase shares						3,600,000
Commitment to purchase shares price per share						$ 6.82
Warrants to purchase shares				1,048,218
Warrants exercise price per share				$ 4.77
Amount of warrants aggregate exercise price				$ 5,000,000
Series 2012-A Preferred Stock [Member]
Equity (Textual)
Preferred stock, liquidation preference per share							$ 8.50
Preferred stock dividend rate							$ 0.6375
Preferred stock, dividend payment rate, variable							Seven and one-half percent (7.5%) of the quotient obtained by dividing (A) the amount by which the EBITDA for a fiscal year of the Company's retail energy provider business exceeds $32 million by (B) 8,750,000 (the "Additional Dividend").
Preferred stock dividend declared							$ 8,750,000