Organization and summary of significant accounting policies (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 1980
Summary of accounting policies (Textual)
Trade accounts receivable, allowance for doubtful accounts	$ 93,000	$ 73,000
Bad debt expense	21,000	0
Shipping, handling and costs	1,188,000	1,165,000
Advertising and promotion expense	2,648,000	2,418,000
Capitalized Catalog Costs Amortized Period, Description	One to 12 months.
Research and development costs	60,000	76,000
Percentage of consolidated net revenues from the Company's top five unaffiliated customers	49.00%	49.00%
Percentage of consolidated accounts receivable from the Company's top five unaffiliated customers	31.00%	23.00%
Number of top unaffiliated customers	5	5
Purchase of royalty rights	160,000
Amortization of royalty	7,000
Star brite trade name and trademark [Member]
Summary of accounting policies (Textual)
Indefinite-lived intangible assets, acquired during period			880,000
Finite-lived intangible asset, useful life			40 years
Equity method investment, ownership percentage in OdorStar Technology, LLC	50.00%
Amortization of acquired intangible assets	$ 51,000	$ 51,000