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Note 10 - Line of Credit and Long-Term Debt (Detail) (USD $)	1 Months Ended	12 Months Ended
	Nov. 30, 2011	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Line of Credit Facility, Maximum Borrowing Capacity			$ 50,000,000
Line of Credit Facility, Increase, Additional Borrowings	50,000,000
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.25%
Line of Credit Facility, Amount Outstanding		24,000,000	24,000,000	0	1,800,000
Line of Credit Facility, Capacity Available for Specific Purpose Other than for Trade Purchases			24,200,000	48,200,000
Debt Instrument, Basis Spread on Variable Rate			1.75%
Debt Instrument, Interest Rate, Stated Percentage			3.25%
Proceeds from Sale of Short-term Investments		27,700,000
Mortgage Loans on Real Estate			262,000	336,000
Mortgage Loans on Real Estate, Interest Rate			3.50%
Debt Instrument Term			15 years
Mortgage Loans on Real Estate, Carrying Amount of Mortgages			262,000
Due to Related Parties, Noncurrent			500,000
TSC Headquarters [Member]
Mortgage Loans on Real Estate			$ 1,100,000