ACCOUNTING STANDARDS UPDATES-summarize the impact of the adoption of ASC 606 (Details) - USD ($)	3 Months Ended				6 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Sep. 30, 2017	Jun. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Apr. 01, 2018	Mar. 31, 2018
ASSETS
Contract assets	$ 5,557,489				$ 5,557,489		$ 2,056,414	$ 347,896
Inventories	2,119,496				2,119,496		976,693	2,088,485
Deferred tax assets	2,346,141				2,346,141			2,046,298
LIABILITIES
Contract liabilities	2,393,881				2,393,881		$ 890,802	180,706
Accrued expenses	787,676				787,676			788,084
SHAREHOLDERS' EQUITY
Retained earnings	237,763				237,763			$ (576,617)
Net sales	3,621,185		$ 4,588,894		7,720,008	$ 10,419,280
Cost of sales	2,526,085				5,572,384
Selling, general and administrative	751,037		720,341		1,481,502	1,640,100
Income (loss) before income taxes	258,089				487,503
Income tax provision (benefit)	77,374		$ 245,516		142,403	$ 533,151
Net income (loss)	$ 180,715				$ 345,100
Net income (loss) per share – basic	$ 0.01		$ 0.01		$ 0.01	$ 0.03
Net income (loss) per share – diluted	$ 0.01		$ 0.01		$ 0.01	$ 0.03
Statement of Cash Flows [Abstract]
Net income	$ 180,715	$ 164,385	$ 368,186	$ 424,502	$ 345,100	$ 792,688
Adjustments to reconcile net income to net cash used in operating activities:
Change in contract loss provision					15,255	29,139
Deferred income taxes					142,403	507,376
Changes in operating assets and liabilities:
Inventories					(1,142,803)	(1,175,103)
Contract assets					(3,501,075)	0
Accrued expenses					121,343	88,319
Contract liabilities					1,503,079	$ 184,742
Restatement Adjustment [Member]
ASSETS
Contract assets	(5,557,489)				(5,557,489)
Inventories	2,007,272				2,007,272
Deferred tax assets	462,137				462,137
LIABILITIES
Contract liabilities	(1,864,483)				(1,864,483)
Accrued expenses	13,022				13,022
SHAREHOLDERS' EQUITY
Retained earnings	(1,236,618)				(1,236,618)
Net sales	(1,381,990)				(3,848,971)
Cost of sales	(624,601)				(2,175,821)
Selling, general and administrative	(512)				(1,426)
Income (loss) before income taxes	(756,875)				(1,671,723)
Income tax provision (benefit)	(210,502)				(454,752)
Net income (loss)	$ (546,374)				$ (1,216,972)
Net income (loss) per share – basic	$ (0.02)				$ (0.04)
Net income (loss) per share – diluted	$ (0.02)				$ (0.04)
Statement of Cash Flows [Abstract]
Net income					$ (1,216,972)
Adjustments to reconcile net income to net cash used in operating activities:
Change in contract loss provision					34,509
Deferred income taxes					(462,137)
Changes in operating assets and liabilities:
Inventories					(2,007,272)
Contract assets					5,557,489
Accrued expenses					(41,134)
Contract liabilities					(1,864,483)
Previously Reported [Member]
ASSETS
Contract assets	$ 0				0
Inventories	4,126,768				4,126,768
Deferred tax assets	2,808,278				2,808,278
LIABILITIES
Contract liabilities	529,398				529,398
Accrued expenses	800,698				800,698
SHAREHOLDERS' EQUITY
Retained earnings	(998,855)				(998,855)
Net sales	2,239,195				3,871,037
Cost of sales	1,901,484				3,396,563
Selling, general and administrative	750,525				1,480,076
Income (loss) before income taxes	(498,786)				(1,184,220)
Income tax provision (benefit)	(133,128)				(312,349)
Net income (loss)	$ (365,659)				$ (871,872)
Net income (loss) per share – basic	$ (0.01)				$ (0.03)
Net income (loss) per share – diluted	$ (0.01)				$ (0.03)
Statement of Cash Flows [Abstract]
Net income					$ (871,872)
Adjustments to reconcile net income to net cash used in operating activities:
Change in contract loss provision					49,764
Deferred income taxes					(319,734)
Changes in operating assets and liabilities:
Inventories					(3,150,075)
Contract assets					2,056,414
Accrued expenses					80,209
Contract liabilities					$ (361,404)