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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Oct. 31, 2017
Oct. 31, 2016
Oct. 31, 2017
Oct. 31, 2016
Cash flows from operating activities:        
Net loss from continuing operations $ (1,289) $ (857) $ (459) $ (1,173)
Net loss from discontinued operations (192) (167) (408) (557)
Net loss (1,481) (1,024) (867) (1,730)
Non-cash charges to earnings     1,451 2,864
Net changes in operating assets and liabilities     1,631 (4,340)
Cash provided by (used in) operating activities – continuing operations     2,215 (3,206)
Cash provided by operating activities – discontinued operations     614 728
Net cash provided by (used in) operating activities     2,829 (2,478)
Cash flows from investing activities:        
Proceeds on redemption of marketable securities     6,477 1,000
Purchase of fixed assets and other assets     (883) (2,413)
Cash provided by (used in) investing activities – continuing operations     5,594 (1,413)
Cash used in investing activities – discontinued operations     (28) (10)
Net cash provided by (used in) investing activities     5,566 (1,423)
Cash flows from financing activities:        
Tax benefit from exercise of stock-based compensation     1 25
Cash provided by financing activities – continuing operations     1 25
Cash used in financing activities – discontinued operations     0 280
Net cash provided by financing activities     1 305
Net increase (decrease) in cash and cash equivalents before effect of exchange rate changes     8,396 (3,596)
Effect of exchange rate changes on cash and cash equivalents     675 1,619
Net increase (decrease) in cash and cash equivalents     9,071 (1,977)
Cash and cash equivalents at beginning of period     2,738 6,082
Cash and cash equivalents at end of period 11,809 4,105 11,809 4,105
Less cash and equivalents of discontinued operations at end of period 794 344 794 344
Cash and cash equivalents of continuing operations at end of period $ 11,015 $ 3,761 11,015 3,761
Supplemental disclosures of cash flow information:        
Interest     41 76
Income Taxes     $ 325 $ 335