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Equity (Details Textual) - USD ($) |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended | 18 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 05, 2020 | Aug. 01, 2019 | May 08, 2019 | Feb. 11, 2019 | Jun. 12, 2018 | Jun. 08, 2018 | Apr. 22, 2020 | Feb. 29, 2020 | Jun. 08, 2018 | Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2020 | Dec. 31, 2019 | Jun. 30, 2020 | Mar. 11, 2013
Equity (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining number of shares available for repurchase |  |  |  |  |  |  |  |  |  | 6,000,000.0 |  |  |  | 6,000,000.0 |  | 6,000,000.0 |
Dividends on preferred stock |  |  |  |  |  |  |  |  |  | $ 370,000 | $ 370,000 | $ 370,000 | $ 370,000 |  |  |  |
Dividends declared per common share |  |  |  |  |  |  |  |  |  | $ 0.085 | $ 0.075 | $ 0.075 | $ 0.075 |  |  |  |
Percentage ownership after all transactions |  |  |  |  |  |  |  |  |  |  |  |  |  | 86.10% |  |  |
Stock option and incentive plan to reserve |  |  | 372,000 |  |  |  |  |  |  |  |  |  |  |  |  | 30,000 |
Unrecognized compensation cost |  |  |  |  |  |  |  |  |  | $ 3,000,000.0 |  |  |  | $ 3,000,000.0 |  | $ 3,000,000.0 |
Weighted-average period |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 years 7 months 6 days |  |  |
Treasury stock outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,200,000 | 1,000,000.0 |  |
Treasury stock cost |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9,200,000 | $ 7,700,000 |  |
Weighted average cost per share |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7.42 | $ 7.46 |  |
Board of Directors [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred stock units vested |  |  |  |  |  |  |  | $ 305,000 |  |  |  |  |  |  |  |  |
Howard S. Jonas [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders grant of options purchase |  |  |  | 126,176 |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price |  |  |  | $ 8.05 |  |  |  |  |  |  |  |  |  |  |  |  |
Lieu of cash bonus |  |  |  | $ 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends on preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders grant of options purchase |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividends per share |  |  |  |  |  |  | $ 0.1594 |  |  |  |  |  |  |  |  |  |
Paid date of declared dividend |  |  |  |  |  |  | Aug. 14, 2020 |  |  |  |  |  |  |  |  |  |
Record date of declared dividend |  |  |  |  |  |  | Aug. 06, 2020 |  |  |  |  |  |  |  |  |  |
Class A common stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends on preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders grant of options purchase |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class A common stock [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared per common share | $ 0.0850 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Paid date of declared dividend | Aug. 26, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Record date of declared dividend | Aug. 18, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class B common stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued for stock repurchase program |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,500 |  |  |
Number of stock authorized to be repurchased |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,000,000.0
Dividends on preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared per common share |  | $ 0.075 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expiration date of the option |  |  |  |  |  |  |  |  |  |  |  |  |  | Jun. 30, 2023 |  |  |
Paid date of declared dividend |  | Aug. 23, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Record date of declared dividend |  | Aug. 16, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants to purchase shares |  |  |  |  |  |  |  |  |  | 1,257,862 |  |  |  | 1,257,862 |  | 1,257,862 |
Warrants exercise price per share |  |  |  |  |  |  |  |  |  | $ 4.77 |  |  |  | $ 4.77 |  | $ 4.77 |
Stockholders grant of options purchase |  |  |  |  |  |  |  |  |  |  | 20 |  | 198 |  |  |  |
Aggregate cost of acquired |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,500,000 |  |  |
Acquired shares |  |  |  |  |  |  |  |  |  | 200,873 |  |  |  | 213,206 |  |  |
Class B common stock [Member] | Howard S. Jonas [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expiration date of the option |  |  |  |  |  |  |  |  | Jun. 30, 2023 |  |  |  |  |  |  |  |
Warrants to purchase shares |  |  |  |  |  | 1,048,218 |  |  | 1,048,218 |  |  |  |  |  |  |  |
Warrants exercise price per share |  |  |  |  |  | $ 4.77 |  |  | $ 4.77 |  |  |  |  |  |  |  |
Amount of warrants aggregate exercise price |  |  |  |  |  | $ 5,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Class B common stock [Member] | Investor [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of aggregate sales price |  |  |  |  | $ 1,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |
Warrants to purchase shares |  |  |  |  | 209,644 |  |  |  |  |  |  |  |  |  |  |  |
Warrants exercise price per share |  |  |  |  | $ 4.77 |  |  |  |  |  |  |  |  |  |  |  |
Amount of warrants aggregate exercise price |  |  |  |  | $ 1,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |

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