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Equity (Details Textual) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 01, 2023 | Jun. 16, 2023 | Jun. 13, 2023 | May 31, 2023 | May 16, 2023 | Mar. 08, 2021 | Jun. 12, 2018 | Jun. 08, 2018 | Feb. 28, 2023 | Nov. 30, 2022 | May 31, 2022 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022 | May 03, 2022 | Feb. 28, 2022 | Feb. 07, 2022 | Mar. 11, 2013
Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends on preferred stock |  |  |  |  |  |  |  |  |  |  |  |  | $ 176 | $ 157 | $ 454 | $ 624 | $ 370 |  |  |  |  |  |  |
Dividends on common stock |  |  |  |  |  |  |  |  |  |  |  | $ 0.075 |  |  | $ 0.075 |  |  | $ 0.225 | $ 0.225 |  |  |  |  |
Treasury Stock, Common, Shares |  |  |  |  |  |  |  |  |  |  |  | 2,944,000 |  |  |  |  |  | 2,944,000 |  | 2,705,000 |  |  |  |
Amount of warrants aggregate exercise price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,000 |  |  |  |  |  |
Unrecognized compensation cost |  |  |  |  |  |  |  |  |  |  |  | $ 1,700 |  |  |  |  |  | $ 1,700 |  |  |  |  |  |
Weighted-average period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |  |  |  |
Deferred stock units granted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 290,000 |  |
Cash dividend paid |  |  |  |  |  |  |  |  |  |  |  | $ 0.075 | $ 0.075 | $ 0.075 | $ 0.075 | $ 0.075 | $ 0.075 |  |  |  |  |  |  |
Redemption of preferred stock |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,359 | $ 1,000 | $ 1,000 | $ 2,000 |  |  |  |  |  |  |  |
Board of Directors [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Liquidation Preference, Value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000 |
Preferred stock, liquidation preference per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8.5 |
Employee [Member] | Lumo Finland Grant [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership |  |  |  |  |  |  |  |  |  | 5.10% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee [Member] | Lumo Sweden [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership |  |  |  |  |  |  |  |  |  | 2.30% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend Paid [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividend rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.5301 |  |  |  |
Dividends on preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500 |  |  |  |
Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption of preferred stock, shares |  |  |  |  |  |  |  |  |  |  |  |  | 866,000 | 117,000 | 117,000 | 235,000 |  |  |  |  |  |  |  |
Redemption of preferred stock |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,359 | $ 1,000 | $ 1,000 | $ 2,000 |  |  |  |  |  |  |  |
Preferred Stock [Member] | Stock Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption of preferred stock, shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 235,294 |  |  |  |  |  |
Redemption of preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,000 |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of common stock shares issued |  |  |  |  |  |  |  |  |  |  | 72,657 |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchased and Retired During Period, Shares |  |  |  |  |  |  |  |  |  |  | 136,987 |  |  |  |  |  |  |  |  |  |  |  |  |
Class B common stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of stock authorized to be repurchased |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,000,000
Number of shares repurchased, shares |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  | 0 |  |  | 0 |  |  |  |  |  |
Remaining number of shares available for repurchase |  |  |  |  |  |  |  |  |  |  |  | 4,700,000 |  |  |  |  |  | 4,700,000 |  |  |  |  |  |
Treasury Stock, Common, Shares |  |  |  |  |  |  |  |  |  |  |  | 2,900,000 |  |  |  |  |  | 2,900,000 |  | 2,700,000 |  |  |  |
Treasury stock cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 22,500 |  | $ 19,000 |  |  |  |
Weighted average cost per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7.63 |  | $ 7.03 |  |  |  |
Warrants to purchase shares |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  | 0 |  |  |  |  |  |
Restricted Stock, Shares Issued Net of Shares for Tax Withholdings |  |  |  |  |  |  |  |  | 290,000 | 123,302 |  |  |  |  |  | 290,000 |  |  |  |  |  |  |  |
Description of vested period |  |  |  |  |  |  |  |  |  | May 2023 and up to May 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class B common stock [Member] | 2021 Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum number of shares reserved for the grant of awards |  |  |  |  |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class B common stock [Member] | Stock Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares repurchased, shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 639,393 |  |  |  |  |
Aggregate amount of shares repurchased |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,400 |  |  |  |  |
Class B common stock [Member] | Stock-Based Compensation [Member] | 2021 Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock option and incentive plan to reserve |  |  |  |  |  | 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class B common stock [Member] | Howard S. Jonas [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants to purchase shares |  |  |  |  |  |  |  | 1,048,218 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of warrants aggregate exercise price |  |  |  |  |  |  |  | $ 5,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants exercise price per share |  |  |  |  |  |  |  | $ 4.77 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares repurchased for withholding tax obligations in connection to the exercise of the options |  |  |  | 158,109 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise of stock options, shares |  |  |  | 256,818 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued during period, shares, issued for cashless exercise |  |  |  | 98,709 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class B common stock [Member] | Investor [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of aggregate sales price |  |  |  |  |  |  | $ 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants to purchase shares |  |  |  |  |  |  | 209,644 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of warrants aggregate exercise price |  |  |  |  |  |  | $ 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants exercise price per share |  |  |  |  |  |  | $ 4.77 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class B common stock [Member] | Preferred Stock [Member] | Stock Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption of preferred stock, shares |  |  | 235,294 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption of preferred stock, authorized amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,000 |  |  |
Redemption of preferred stock |  |  | $ 2,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class B common stock [Member] | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders grant of options purchase |  |  |  |  |  |  |  |  |  |  |  |  | 300,000 | 33,000 | 290,000 |  | 9,000 |  |  |  |  |  |  |
Exercise of stock options, shares |  |  |  |  |  |  |  |  |  |  |  |  | 257,000 |  |  |  |  |  |  |  |  |  |  |
Class B common stock [Member] | Warrant [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants to purchase shares |  |  |  |  |  |  |  | 1,048,218 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise of stock options, shares |  |  |  |  |  |  |  |  |  |  | 209,644 |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued, value, warrants exercised |  |  |  |  |  |  |  | $ 5,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series 2012-A Preferred Stock [Member] | Preferred Stock [Member] | Stock Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividend rate |  | $ 0.1349 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption of preferred stock, shares |  | 748,064 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption Date |  |  |  |  | Jun. 16, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Price per share |  |  |  |  | $ 8.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares outstanding |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividend redeemable |  | $ 100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption of preferred stock |  | $ 6,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class A Common Stock and Class B Common Stock [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends on common stock | $ 0.075 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Paid date of declared dividend | Nov. 21, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Record date of declared dividend | Nov. 13, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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