Note 5 - Digital Link II Joint Venture (Detail) (USD $)	1 Months Ended	3 Months Ended
	Mar. 31, 2007	Mar. 31, 2013	Mar. 31, 2012	Mar. 06, 2007
Number of Members of Joint Venture	2
Equity Method Investment, Ownership Percentage		44.40%		44.40%
Joint Venture Ownership Percentage by Partner in Venture				55.60%
Number of Tranche in Period		4
Number of Weeks in Each Tranche of Period		13
Length of Fiscal Year		52
Income (Loss) from Equity Method Investments (in Dollars)		$ (106,000)	$ 91,000
Proceeds from Equity Method Investment, Dividends or Distributions, Return of Capital (in Dollars)		0	1,509,000
Joint Venture II [Member]
Income (Loss) from Equity Method Investments (in Dollars)		(100,000)	90,000
Gross Margin Recognized on Equity Method Investee Sales (in Dollars)			$ 200,000