Note 7 - Intangible Assets (Details) - Intangible Assets (USD $)	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Cost	$ 168,148	$ 168,148
Weighted average amortization period (years)	7 years 146 days
Accumulated amortization	(113,398)	(101,682)
Net carrying amount	54,750	66,466
Patents and Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	82,702	82,702
Weighted average amortization period (years)	15 years	15 years
Accumulated amortization	(64,369)	(62,464)
Net carrying amount	18,333	20,238
Formulas [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	25,446	25,446
Weighted average amortization period (years)	15 years	15 years
Accumulated amortization	(6,291)	(4,595)
Net carrying amount	19,155	20,851
Noncompete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	50,000	50,000
Weighted average amortization period (years)	7 years	7 years
Accumulated amortization	(32,738)	(25,595)
Net carrying amount	17,262	24,405
Customer Lists [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	10,000	10,000
Weighted average amortization period (years)	3 years	3 years
Accumulated amortization	(10,000)	(9,028)
Net carrying amount		$ 972