Note 10 - Information by Industry Segment (Details) - USD ($)	3 Months Ended		9 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Sep. 30, 2015
Indicators and Gauges [Member]
Revenue	$ 368,065	$ 332,771	$ 882,125	$ 933,707
Income (Loss) before provision for Income Taxes
Income (Loss) before provision for Income Taxes	102,085	54,783	165,321	119,379
Asset Information
Assets	822,392	721,504	822,392	721,504
Revenue:
Revenue	368,065	332,771	882,125	933,707
Automotive Diagnostic Tools and Equipment [Member]
Revenue	1,162,179	1,471,843	3,071,615	3,124,307
Income (Loss) before provision for Income Taxes
Income (Loss) before provision for Income Taxes	224,083	294,830	261,211	172,283
Asset Information
Assets	1,917,982	1,705,065	1,917,982	1,705,065
Revenue:
Revenue	1,162,179	1,471,843	3,071,615	3,124,307
Corporate Segment [Member]
Income (Loss) before provision for Income Taxes
Income (Loss) before provision for Income Taxes	(334,263)	(239,982)	(946,260)	(729,350)
Asset Information
Assets	856,583	829,397	856,583	829,397
UNITED STATES
Revenue	1,506,778	1,739,642	3,851,487	3,935,224
Revenue:
Revenue	1,506,778	1,739,642	3,851,487	3,935,224
AUSTRALIA
Revenue	21,471	1,602	60,412	13,402
Revenue:
Revenue	21,471	1,602	60,412	13,402
CANADA
Revenue	1,995	21,487	16,693	57,041
Revenue:
Revenue	1,995	21,487	16,693	57,041
MEXICO
Revenue		7,283	4,360	17,747
Revenue:
Revenue		7,283	4,360	17,747
CHINA
Revenue		29,657		29,657
Revenue:
Revenue		29,657		29,657
England [Member]
Revenue		4,943	20,260	4,943
Revenue:
Revenue		4,943	20,260	4,943
Other Foreign Countries [Member]
Revenue			528
Revenue:
Revenue			528
Revenue	1,530,244	1,804,614	3,953,740	4,058,014
Income (Loss) before provision for Income Taxes	(8,095)	109,631	(519,728)	(437,688)
Assets	3,596,957	3,255,966	3,596,957	3,255,966	$ 3,866,575
Revenue	$ 1,530,244	$ 1,804,614	$ 3,953,740	$ 4,058,014