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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Jan. 31, 2018
Jan. 31, 2017
Cash flows from operating activities:    
Net earnings $ 3,875 $ 3,225
Adjustments to reconcile net earnings to net cash (used in) provided by operating activities:    
Depreciation 2,104 1,960
Bad debt provision 71 (42)
Stock based compensation expense 276 150
Expense (benefit) for deferred income taxes 639 (12)
Change in assets and liabilities:    
Increase (decrease) in receivables (1,025) 2,090
Increase in inventories (2,745) (105)
Increase (decrease) in accounts payable and other accrued expenses 2,020 (1,189)
Decrease in deferred revenue (3,847) (237)
Other, net (2,013) 11
Net cash (used in) provided by operating activities (645) 5,851
Cash flows from investing activities:    
Capital expenditures (1,907) (2,190)
Decrease (increase) in restricted cash (58) 129
Net cash used in investing activities (1,965) (2,061)
Cash flows from financing activities:    
Dividends paid (1,331) (1,163)
Dividends paid to holders of noncontrolling interest in subsidiaries (74)  
Proceeds from short-term borrowings 44,639 39,804
Repayments on short-term borrowings (43,452) (38,943)
Payments on long-term debt (626) (316)
Net proceeds from exercise of stock options 8 141
Net cash used in financing activities (836) (477)
Effect of exchange rate changes on cash and cash equivalents 118 (281)
(Decrease) increase in cash and cash equivalents (3,328) 3,032
Cash and cash equivalents, beginning of period 12,506 5,222
Cash and cash equivalents, end of period $ 9,178 $ 8,254