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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
OPERATING ACTIVITIES:    
Net income $ 7,272 $ 3,817
Adjustments to reconcile net income from continuing operations to net cash used for operating activities:    
Depreciation and amortization 730 429
Stock-based compensation expense 129 44
Non-cash investment expense 255
Non-cash interest income (23) (37)
Equity in loss of affiliate company 104 25
Changes in operating assets and liabilities:    
Accounts receivable (2,328) (1,811)
Other current assets 163 1,249
Other long-term assets (65) (57)
Accounts payable 8 (52)
Accrued payroll 904 724
Deferred revenue, current portion (339) 70
Accrued expenses 27 (27)
Other current liabilities 1,167 341
Deferred revenue, net of current portion (70) 16
Net cash provided by (used for) operating activities 7,679 4,986
INVESTING ACTIVITIES:    
Purchases of property and equipment (1,553) (663)
Advances of notes receivable (1,500) (1,035)
Net cash used for investing activities (3,053) (1,698)
FINANCING ACTIVITIES:    
Sale of capital stock pursuant to exercise of option 163 34
Net cash provided by financing activities 163 34
Effects of exchange rate changes on cash (32) 4
Net increase in cash 4,757 3,326
Cash at beginning of period 18,919 14,024
Cash at end of period 23,676 17,350
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:    
Cash paid during the period for income taxes $ 875