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Note 10 - Fair Value Measurements (Details) - Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013
Financial Assets:
Tribute warrant	$ 204
Tribute warrant	204
Available-for-sale securities	3,119
Financial Liabilities:
Warrant liability	292
Warrant liability	292
Tribute Warrant [Member] \| Fair Value, Inputs, Level 3 [Member]
Financial Assets:
Tribute warrant	204
Tribute Warrant [Member]
Financial Assets:
Tribute warrant	204
Fair Value, Inputs, Level 2 [Member]
Financial Assets:
Available-for-sale securities	3,119
Fair Value, Inputs, Level 3 [Member]
Financial Assets:
Tribute warrant	204
Financial Liabilities:
Warrant liability	$ 292

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled after one year or the normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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