Note 5 - Digital Link II Joint Venture (Details) (USD $)	3 Months Ended	9 Months Ended			3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Mar. 06, 2007	Sep. 30, 2014 Joint Venture II [Member]	Sep. 30, 2013 Joint Venture II [Member]	Sep. 30, 2014 Joint Venture II [Member]	Sep. 30, 2013 Joint Venture II [Member]
Note 5 - Digital Link II Joint Venture (Details) [Line Items]
Number of Members of Joint Venture				2
Equity Method Investment, Ownership Percentage				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		91 days
Length of Fiscal Year		364 days
Income (Loss) from Equity Method Investments	$ 2,000	$ 95,000	$ (117,000)		$ 0	$ (100,000)	$ 100,000	$ (100,000)
Sales to Equity Method Investee					0	0	0	0
Proceeds from Equity Method Investment, Dividends or Distributions		$ 0	$ 0