Note 4 - Corporate Borrowings And Capital Lease Obligations (Detail) - Indebtedness Outstanding Summary (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Jul. 20, 2009
Revolving Credit Agreement, 2.84% (variable interest rate)			$ 2,000
Less revolving credit agreement			2,000
Less current maturities of long term debt	1,683	1,670
Long-term debt	5,168	6,852
Debt And Capital Lease Obligations [Member]
Total	32,744	29,664
Wells Fargo Bank [Member]
Revolving Credit Agreement, 2.84% (variable interest rate)		(21,142)
Less revolving credit agreement		(21,142)
Current Maturities [Member]
Less current maturities of long term debt	(1,683)	(1,670)
Total [Member]
Long-term debt	31,061	6,852
US Bancorp [Member]
Water Cooling System Capital Lease Obligation, 2.61%, due monthly to May, 2017	5,603	6,754
Other Capital Lease Obligations, 0.61%, due monthly to October, 2013.	5,603	6,754
Capital Lease Obligations [Member]
Water Cooling System Capital Lease Obligation, 2.61%, due monthly to May, 2017	178	394
Other Capital Lease Obligations, 0.61%, due monthly to October, 2013.	178	394
Union State Bank Bank Of Atchison [Member]
Secured Promissory Note, 6.39% (variable interest rate), due monthly to July, 2016.	1,070	1,374
Wells Fargo Bank [Member]
Revolving Credit Agreement, 2.84% (variable interest rate)	25,893	21,142
Less revolving credit agreement	$ 25,893	$ 21,142