General Credit Agreement	9 Months Ended
General Credit Agreement	Sep. 30, 2013
General Credit Agreement [Abstract]
General Credit Agreement	4. GENERAL CREDIT AGREEMENT The Company has a general credit agreement with Bremer Bank, which provides a revolving credit line of up to $3,000,000. On May 6, 2013, the Company signed an amendment with Bremer Bank extending the expiration date from May 5, 2013 to May 5, 2014, while keeping previous provisions intact. The Company had no borrowings under this credit line at September 30, 2013 or December 31, 2012. The credit agreement contains certain covenants requiring the Company to maintain certain financial ratios. The Company was in compliance with these requirements as of September 30, 2013.

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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