CONSOLIDATED STATEMENTS OF CASHFLOWS	9 Months Ended
	Jan. 31, 2020 USD ($)	Jan. 31, 2019 USD ($)
Cash flows from operating activities:
Net income (loss)	$ 314,000	$ (417,000)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock compensation cost amortized	81,000	81,000
Depreciation	273,000	253,000
Changes in operating assets and liabilities:
Trade receivables	358,000	742,000
Contract assets	155,000	(901,000)
Inventories	(540,000)	(535,000)
Prepaid expenses and other assets	(37,000)	116,000
Operating lease right-of-use assets	(192,000)
Trade accounts payable	585,000	412,000
Accrued liabilities	(83,000)	(147,000)
Current and long-term operating lease liabilities	(133,000)
Customer deposits	(24,000)	(194,000)
Net cash provided by (used in) operating activities	1,141,000	(590,000)
Cash flows from investing activities:
Capital expenditures	(370,000)	(108,000)
Proceeds from disposal of equipment	1,000
Net cash used in investing activities	(369,000)	(108,000)
Cash flows from financing activities:
Principal payments on long-term debt	(23,000)	(1,671,000)
Principal payments under capital and financing lease obligations	(53,000)	(53,000)
Payments on line of credit	(11,636,000)	(1,258,000)
Proceeds from long-term debt		859,000
Proceeds from line of credit	11,297,000	2,286,000
Net cash provided by financing activities	(415,000)	163,000
Net increase (decrease) in cash	357,000	(535,000)
Cash, beginning of period	58,000	575,000
Cash, end of period	415,000	40,000
Cash paid during the period for:
Interest	77,000	$ 81,000
Capital leases reclassified from long-term debt to finance lease liabilities	98,000
Deferred lease reclassified from accrued liabilities to operating right-of-use assets	$ 206,000