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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Operating activities    
Net income $ 4,139 $ 4,850
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 470 97
Provision for doubtful accounts receivable 25 (3)
Stock-based compensation 1,238 1,210
Equity in the net loss of AMSO, LLC 222
Change in assets and liabilities:    
Restricted cash 47 (294)
Trade accounts receivable 1,631 (592)
Inventory (933) 4,640
Prepaid expenses 47 3,037
Other current assets and other assets (1,855) (1,055)
Trade accounts payable, accrued expenses and other current liabilities (1,571) (2,998)
Advances from customers (410) (442)
Due to IDT Corporation (62) (253)
Income taxes payable 874 701
Net cash provided by operating activities 3,640 9,120
Investing activities    
Capital expenditures (222) (84)
Investments in capitalized exploration costs-unproved oil and gas property (1,127) (8,031)
Deposit for investment (94)
Repayment of notes receivable 446
Capital contributions to AMSO, LLC (63)
Net cash used in investing activities (997) (8,178)
Financing activities    
Dividends paid (2,220) (1,849)
Purchase of equity of subsidiary (278)
Proceeds from revolving line of credit 10,450
Repayment of revolving line of credit (10,001)
Repurchases of Class B common stock from employees (23) (29)
Payment for acquisitions (104)
Net cash used in financing activities (2,072) (1,982)
Effect of exchange rate changes on cash and cash equivalents 208 153
Net increase (decrease) in cash and cash equivalents 779 (887)
Cash and cash equivalents at beginning of period 35,192 38,786
Cash and cash equivalents at end of period $ 35,971 $ 37,899