Note 7 - Loan and Credit Agreements (Detail) - Summary Of Term Debt (USD $)	Aug. 31, 2012	May 31, 2012	May 10, 2012	Apr. 26, 2012	Nov. 30, 2011	Sep. 15, 2010	May 31, 2010	Jun. 07, 2007
Long Term Debt	$ 8,739,368	$ 2,000,000	$ 880,000	$ 2,659,000	$ 6,456,121	$ 13,000	$ 1,300,000	$ 4,100,000
Less current portion of term debt	1,149,926				712,962
Term debt, excluding current portion	7,589,442				5,743,159
West Bank [Member] | Number 1 [Member]
Long Term Debt	2,532,493				2,804,403
West Bank [Member] | Number 2 [Member]
Long Term Debt	1,047,691				1,102,321
West Bank [Member] | Number 3 [Member]
Long Term Debt	1,191,007				1,253,507
West Bank [Member] | Number 4 [Member]
Long Term Debt	1,936,663				0.00
US Bank [Member]
Long Term Debt	851,897				0.00
Iowa Finance Authority [Member]
Long Term Debt	1,056,544				1,143,140
IDED [Member] | Number 1 [Member]
Long Term Debt	48,485				70,024
IDED [Member] | Number 2 [Member]
Long Term Debt	17,091				25,229
IDED [Member] | Number 3 [Member]
Long Term Debt	48,830				48,830
West Union Community Development Corp [Member]
Long Term Debt	$ 8,667				$ 8,667