Note 9 - Segment and Related Information (Details) - Information by Industry Segment (USD $)	3 Months Ended		6 Months Ended	9 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Mar. 31, 2013	Jun. 30, 2014	Jun. 30, 2013	Sep. 30, 2013
Net Revenue
Net Sales	$ 2,130,412	$ 1,339,931	$ 5,043,172	$ 4,297,121	$ 5,043,172
Income (Loss) before provision for Income Taxes
Income (Loss) before Provision for Income Taxes	386,911	(133,777)		(231,031)	129,458
Asset Information
Asset Information	4,204,703	3,443,740	3,443,740	4,204,703	3,443,740	3,504,683
Revenue:
Geographical Information - Revenue	2,130,412	1,339,931	5,043,172	4,297,121
Indicators and Gauges [Member]
Net Revenue
Net Sales	460,749	432,912	1,260,745	1,211,350
Income (Loss) before provision for Income Taxes
Income (Loss) before Provision for Income Taxes	138,030	109,648	334,488	227,434
Asset Information
Asset Information	800,751		909,801	800,751
Automotive Diagnostic Tools and Equipment [Member]
Net Revenue
Net Sales	1,669,663	907,019	3,782,427	3,085,771
Income (Loss) before provision for Income Taxes
Income (Loss) before Provision for Income Taxes	531,969	31,741	636,641	430,759
Asset Information
Asset Information	2,836,401		1,377,016	2,836,401
General Corporate Expenses [Member]
Income (Loss) before provision for Income Taxes
Income (Loss) before Provision for Income Taxes	(283,088)	(275,166)	(841,671)	(889,224)
Total [Member]
Income (Loss) before provision for Income Taxes
Income (Loss) before Provision for Income Taxes	386,911	(133,777)	129,458	(231,031)
Corporate Segment [Member]
Asset Information
Asset Information	567,551		1,156,923	567,551
UNITED STATES
Revenue:
Geographical Information - Revenue	2,103,243	1,323,179	4,919,864	4,201,849
AUSTRALIA
Revenue:
Geographical Information - Revenue	5,996		14,231	30,134
CANADA
Revenue:
Geographical Information - Revenue	14,197	16,752	67,450	35,911
UNITED KINGDOM
Revenue:
Geographical Information - Revenue			5,245
MEXICO
Revenue:
Geographical Information - Revenue	6,976		10,536	25,288
TAIWAN, PROVINCE OF CHINA
Revenue:
Geographical Information - Revenue			22,481
Other Foreign Countries [Member]
Revenue:
Geographical Information - Revenue			$ 3,365	$ 3,939