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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
OPERATING ACTIVITIES      
Net loss $ (8,636) $ (27,407) $ (5,341)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:      
Depreciation $ 428 132 $ 110
Goodwill impairment 3,562
Gain on adjustment to estimated contingent payments (206)
Deferred income taxes $ (180) (622) $ (241)
Provision for doubtful accounts receivable (29) 310 800
Stock-based compensation 5,229 $ 10,758 4,180
Loss on disposal of property 156 37
Equity in the net loss of AMSO, LLC 397 3,194
Change in assets and liabilities, net of effect of acquisitions:      
Restricted cash (1,062) $ 3,923 (4,713)
Trade accounts receivable 4,234 11,189 (2,679)
Inventory (274) (7,822) (700)
Prepaid expenses (5,615) (2,306) (93)
Other current assets and other assets (2,346) (2,664) (243)
Trade accounts payable, accrued expenses and other current liabilities 3,689 (5,718) 6,883
Advances from customers 652 (700) (746)
Due to IDT Corporation (104) 1 (59)
Income taxes payable 380 (1,532) 831
Net cash (used in) provided by operating activities (3,081) (19,102) 1,220
INVESTING ACTIVITIES      
Capital expenditures (324) $ (1,437) $ (313)
Investments in capitalized exploration costs - unproved oil and gas property (26,969)
Capital contributions to AMSO, LLC (250) $ (2,700)
Payment for acquisitions, net of cash acquired     $ (772)
Repayment of notes receivable $ 50
Issuance of notes receivable $ (82) $ (750)
Purchases of certificates of deposit $ (8,820) (4,655) (4,329)
Proceeds from maturities of certificates of deposit $ 4,688 $ 4,334 2,205
Purchases of marketable securities (3)
Proceeds from maturities of marketable securities 10,433
Net cash (used in) provided by investing activities $ (31,625) $ (1,840) 3,771
FINANCING ACTIVITIES      
Dividends paid (4,431) (2,825) $ (1,131)
Payment for acquisitions (358) $ (1,138)
Proceeds from revolving credit loan payable $ 2,000
Proceeds from sales of Class B common stock to Howard S. Jonas $ 24,552
Distributions to noncontrolling interests   $ (42)
Proceeds from sales of equity of subsidiaries $ 2,500 422
Proceeds from exercise of stock options 174 $ 28 $ 93
Collection of receivables for issuance of equity 1,912
Payment for option to purchase noncontrolling interests (175)
Repurchases of Class B common stock (27) $ (1,070) $ (269)
Net cash provided by (used in) financing activities 1,595 19,547 (927)
Effect of exchange rate changes on cash and cash equivalents 2 (595) 412
Net (decrease) increase in cash and cash equivalents (33,109) (1,990) 4,476
Cash and cash equivalents at beginning of period 71,895 73,885 69,409
Cash and cash equivalents at end of period 38,786 71,895 73,885
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION      
Cash payments made for interest 10 3 12
Cash payments made for income taxes 49 $ 2,647 $ 2,069
SUPPLEMENTAL SCHEDULE OF NON-CASH FINANCING AND INVESTING ACTIVITIES      
Subsidiary equity grant reclassified to liability 1,200    
Receivables for issuance of equity of subsidiaries $ 2,500
Liabilities incurred for acquisitions $ 2,475