Note 7 - Loan and Credit Agreements (Details) (USD $)	6 Months Ended				1 Months Ended	6 Months Ended					6 Months Ended	12 Months Ended			6 Months Ended
	May 31, 2014	Nov. 30, 2013	May 31, 2014 West Bank Loan 1 [Member]	May 31, 2014 West Bank Loan 2 [Member]	May 31, 2013 US Bank, New Loans [Member]	May 31, 2014 US Bank, New Loans [Member]	May 31, 2013 West Bank [Member]	May 29, 2014 US Bank [Member]	Nov. 30, 2013 US Bank [Member]	May 10, 2012 US Bank [Member]	May 31, 2014 Iowa Finance Authority [Member]	Nov. 30, 2013 Iowa Finance Authority [Member]	Feb. 28, 2013 Iowa Finance Authority [Member]	May 01, 2010 Iowa Finance Authority [Member]	May 31, 2014 Line of Credit [Member]
Note 7 - Loan and Credit Agreements (Details) [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 8,000,000
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum															3.50%
Line of Credit Facility, Interest Rate at Period End	3.50%
Line of Credit Facility, Amount Outstanding	4,064,740
Line of Credit Facility, Borrowing Capacity, Description	The Line of Credit states that the borrowing base will be an amount equal to the sum of 75% of accounts receivable (discounted for aged accounts and customer balances exceeding 20% of aggregate receivables), plus 50% of inventory (this component cannot exceed $6,000,000 and only includes finished goods and raw materials deemed to be in good condition and not obsolete), less any outstanding loan balance of the Line of Credit, and less undrawn amounts of outstanding letters of credit issued by U.S. Bank or any affiliate.
Line of Credit Facility, Borrowing Capacity, Borrowing Base, Percentage of Accounts Receivable	75.00%
Line of Credit Facility, Borrowing Capacity, Borrowing Base, Minimum Percentage of Aggregate Receivables	20.00%
Line of Credit Facility, Borrowing Capacity, Borrowing Base, Percentage of Inventory	50.00%
Line of Credit Facility, Borrowing Capacity, Borrowing Base, Maximum Inventory Amount	6,000,000
Long-term Debt	7,860,680	7,480,923	4,342,000	1,749,000							841,521	904,662
Debt Instrument, Interest Rate, Stated Percentage			4.75%	4.50%		2.98%					2.75%	2.75%	2.75%	3.50%
Debt Instrument, Face Amount						6,319,000		1,000,000		880,000				1,300,000
Debt Instrument, Periodic Payment						93,850					12,500	12,500
Term Loan Final Payment						1,372,000		890,000		283,500
Debt Instrument, Fee Amount							130,000
Debt Issuance Cost					$ 9,000
Debt Instrument, Covenant, Debt to Tangible Net Worth Ratio						1.5
Debt Instrument, Covenant, Fixed Charge Coverage Ratio						1.15
Debt Instrument, Covenant, Interest Rate Increase in Event of Default						5.00%			5.00%
Debt Instrument, Covenant, Debt Service Coverage Ratio													1.5