| In millions, except per share items | Dec-31-22 | Dec-31-21 | Dec-31-20 | Dec-31-19 | Dec-31-18 | Dec-31-17 | Dec-31-16 | Dec-31-15 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| Operating activities | | | | | | | | |
| Net income | 86.9 | 27.8 | 15.6 | 1.4 | 21.4 | -8.6 | -32.2 | -8.6 |
| |
| Adjustments to reconcile net income to net cash from (used in) operating activities: | | | | | | | | |
| Depreciation and amortization | 0.4 | 0.4 | 3.0 | 3.6 | 2.1 | 2.1 | 0.6 | 0.4 |
| Deferred income taxes | | | | | | | | |
| Provision for doubtful accounts receivables | 2.5 | 1.7 | 2.8 | 0.7 | 0.9 | 0.8 | 0.0 | 0.0 |
| Stock-based compensation | 3.0 | 2.8 | 1.1 | 1.1 | 4.5 | 5.2 | 4.8 | 5.2 |
| Equity in the net (income) loss in equity method investees | | | -0.1 | 4.8 | | | 0.2 | 0.4 |
| Gain on sale of subsidiary | | | | | | | | |
| Change in assets and liabilities: | | | | | | | | |
| Trade accounts receivable | -16.3 | -0.4 | -2.3 | -12.0 | 7.8 | -8.0 | -6.0 | 4.2 |
| Inventory | 2.0 | -0.8 | -0.3 | -6.7 | -4.8 | 2.0 | 5.7 | -0.3 |
| Prepaid expenses | -2.7 | -0.4 | 1.9 | -0.1 | 0.2 | -2.0 | 7.5 | -5.6 |
| Other current assets and other assets | -5.6 | -0.7 | -4.0 | 1.1 | 2.7 | -3.7 | 2.9 | -2.3 |
| Trade accounts payable, accrued expenses and other liabilities | 11.6 | -3.5 | -0.4 | 5.5 | -7.8 | 15.1 | -9.6 | 4.3 |
| Due to IDT Corporation, net | -0.4 | 0.3 | -0.1 | 0.1 | 0.0 | 0.1 | -0.3 | -0.1 |
| Income taxes payable | 13.1 | 7.9 | 0.3 | 0.1 | -0.7 | -0.2 | 1.5 | 0.4 |
| Net cash provided by operating activities of continuing operations | 66.0 | 23.7 | 25.0 | 15.8 | 19.4 | 9.4 | 15.6 | -3.1 |
| Net cash provided by operating activities | 80.7 | 68.4 | 23.1 | 15.8 | 19.4 | 9.4 | 15.6 | -3.1 |
| |
| Investing activities | | | | | | | | |
| Capital expenditures | | | | | | -3.3 | -0.6 | -0.3 |
| Purchase of marketable equity securities and other investments | | -1.0 | -5.0 | | | | | |
| Repayment of notes receivable | 0.0 | 0.0 | 0.0 | | | | | |
| Net cash used in investing activities of continuing operations | -5.2 | 2.7 | -2.5 | -5.8 | -2.9 | -16.5 | -9.5 | -31.6 |
| Net cash used in investing activities | -49.3 | 2.7 | -3.0 | -5.8 | -2.9 | -16.5 | -9.5 | -31.6 |
| |
| Financing activities | | | | | | | | |
| |
| Dividends paid to preferred stock stockholders | | | | | | | | |
| Repurchase of Class B common stock | -4.4 | -3.8 | -1.7 | -5.6 | | -1.1 | 0.0 | 0.0 |
| Net cash used in financing activities | -25.5 | -5.7 | -15.2 | -15.6 | -4.2 | -8.1 | -9.7 | 1.6 |