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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 earnings (loss) $ (608) $ 496
Adjustments to reconcile net earnings (loss) to net cash used in operating activities:    
Depreciation and amortization 687 644
Bad debt provision 8 36
Stock based compensation expense 112 74
Deferred income taxes (27) (16)
Change in assets and liabilities:    
Receivables (2,843) (3,008)
Inventories (1,128) 855
Accounts payable and other accrued expenses 1,065 835
Deferred revenue (1,076) (76)
Other, net 542 (247)
Net cash used in operating activities (3,268) (407)
Cash flows from investing activities:    
Capital expenditures (922) (1,183)
Net cash used in investing activities (922) (1,183)
Cash flows from financing activities:    
Dividends paid 0 (522)
Proceeds from short-term borrowings 23,885 16,650
Repayments on short-term borrowings (20,080) (12,884)
Payments on long-term debt and lease obligations (5) (296)
Net proceeds from exercise of stock options (15) (14)
Net cash provided by financing activities 3,785 2,934
Effect of exchange rate changes on cash and cash equivalents 15 81
Increase (decrease) in cash, cash equivalents and restricted cash (390) 1,425
Cash, cash equivalents and restricted cash, beginning of period 5,215 11,156
Cash, cash equivalents and restricted cash, end of period $ 4,825 $ 12,581