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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Operating activities    
Net income (loss) $ 7,301 $ (2,341)
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 1,548 1,855
Impairment of assets 993
Deferred income taxes 2,537 777
Provision for doubtful accounts receivable 1,215 314
Loss on sale of assets held for sale 78
Stock-based compensation 884 772
Equity in the net loss of equity method investees 1,552 1,868
Gain on deconsolidation of subsidiaries (98)
Change in assets and liabilities:    
Trade accounts receivable 6,847 2,917
Inventory 1,930 (961)
Prepaid expenses 2,016 (2,069)
Other current assets and other assets 223 (698)
Trade accounts payable, accrued expenses and other current liabilities (1,006) 2,348
Contract liability (12,707) (357)
Due to IDT Corporation (286) (42)
Income taxes payable 615 (511)
Net cash provided by operating activities 13,642 3,872
Investing activities    
Capital expenditures (99) (329)
Proceeds from Sale of Property, Plant, and Equipment 5
Payments for intangible acquisition (298)
Investments in equity method investee (1,502)
Payments for business acquisition, net of cash acquired (1,852)
Investments in notes receivables (177)
Repayment of notes receivable 12 282
Net cash used in investing activities (1,882) (2,076)
Financing activities    
Dividends paid (4,955) (4,809)
Repayment of short-term debt—Lumo 2,260
Proceeds from revolving line of credit 1,000
Repayment of revolving line of credit 3,514
Proceeds from Loan 1,395
Repayments of Notes Payable 930
Exercise of stock options 965
Purchases of Class B common stock (1,546)
Repayment of notes payable (17) (28)
Net cash used in financing activities (8,567) (6,132)
Effect of exchange rate changes on cash, cash equivalents, and restricted cash 12 12
Net increase (decrease) in cash, cash equivalents, and restricted cash 3,205 (4,324)
Cash, cash equivalents, and restricted cash at beginning of period 38,554 44,197
Cash, cash equivalents, and restricted cash at end of period $ 41,759 $ 39,873