CONSOLIDATED STATEMENTS OF CASHFLOWS - USD ($)	3 Months Ended
	Jul. 31, 2020	Jul. 31, 2019
Cash flows from operating activities:
Net income	$ 730,000	$ 444,000
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Stock compensation cost amortized	27,000	27,000
Depreciation	96,000	92,000
Deferred income taxes	(288,000)
Changes in operating assets and liabilities:
Trade receivables	(1,279,000)	122,000
Contract assets	603,000	(69,000)
Inventories	(365,000)	(202,000)
Prepaid expenses and other assets	(121,000)	(199,000)
Operating lease right-of-use assets	88,000	53,000
Trade accounts payable	(790,000)	46,000
Accrued liabilities	229,000	511,000
Current and long-term operating lease liabilities	(62,000)	(53,000)
Customer deposits	52,000	2,000
Net cash provided by (used in) operating activities	(1,080,000)	774,000
Cash flows from investing activities:
Capital expenditures	(41,000)	(116,000)
Net cash used in investing activities	(41,000)	(116,000)
Cash flows from financing activities:
Principal payments on long-term debt	(9,000)	(7,000)
Principal payments under capital and financing lease obligations	(15,000)	(16,000)
Payments on line of credit	(2,938,000)	(3,777,000)
Proceeds from line of credit	3,837,000	3,437,000
Net cash provided by financing activities	875,000	(363,000)
Net increase (decrease) in cash	(246,000)	295,000
Cash, beginning of period	2,263,000	58,000
Cash, end of period	2,017,000	353,000
Cash paid during the period for:
Interest	$ 23,000	27,000
Non-cash investing and financing activities:
Capital leases reclassified from long-term debt to finance lease liabilities		98,000
Deferred rent reclassified from accrued liabilities to operating lease right-of-use assets		$ 206,000