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Line of Credit	6 Months Ended
Line of Credit	Jun. 30, 2013
Debt Disclosure [Abstract]
Debt Disclosure [Text Block]	Note 5. Line of Credit The Company has a $9,000,000 renewable line of credit with a bank that has been in place since June 2004 and has a maturity date of August 1, 2014. The line of credit is drawn on from time to time as needed for equipment purchases and working capital. Amounts drawn against the line of credit are at an interest rate per year equal to the Bank’s prime rate minus 0.5 percentage point, or alternately, at the Company’s discretion, the LIBOR rate plus 1.0 percentage point, and are secured by the Company’s cash invested with the Bank. The Company is in compliance with all debt covenants under the agreement. The weighted average interest rate during the first six months of 2013 was 1.43%. At June 30, 2013, $8,700,000 was borrowed against the line of credit, compared to $8,550,000 at December 31, 2012.

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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