Note 9 - Notes Payable	12 Months Ended
Dec. 31, 2014
Debt Disclosure [Abstract]
Debt Disclosure [Text Block]	9. Notes Payable The Company maintains a credit facility with Wells Fargo Bank that expires in May 2016. Pursuant to the terms of the credit facility, the Company has borrowing capacity up to $3,500,000 based on eligible accounts receivable and inventories. The Company had no borrowings on the line of credit as of December 31, 2014. The credit facility bears interest at prime plus 0.5% (prime rate was 3.25% as of December 31, 2014 and 2013) and is collateralized by accounts receivable, inventories, trademarks, patents and property and equipment. Under the terms of the facility, the Company pays a 0.6% unused loan fee, on a quarterly basis. As of December 31, 2014, the Company had no outstanding borrowings on its line of credit and no other debt.

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

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