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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Jul. 31, 2020
Jul. 31, 2019
Cash flows from operating activities:    
Net loss $ (262) $ (591)
Non-cash charges to earnings 1,205 2,506
Net changes in operating assets and liabilities (881) (1,762)
Net cash provided by operating activities 62 153
Cash flows from investing activities:    
Proceeds on redemption of marketable securities 725 750
Purchase of marketable securities 0 (1,435)
Purchase of fixed assets and other assets (211) (912)
Net cash provided by (used in) investing activities 514 (1,597)
Net cash used in financing activities:    
Repayment of PPP Loan (4,965) 0
Proceeds from UBS line of credit 3,012 0
(1,953) 0
Net decrease in cash and cash equivalents (1,377) (1,444)
Cash and cash equivalents at beginning of period 3,808 3,683
Cash and cash equivalents at end of period 2,431 2,239
Supplemental disclosures of cash flow information:    
Interest 39 24
Income taxes $ 0 $ 0