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Note 5 - Marketable Securities - Marketable Securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Adjusted Cost $ 4,576 $ 4,849
Unrealized Gains 193 272
Unrealized Losses (9)
Fair Value 4,760 5,121
Corporate Debt Securities [Member]    
Adjusted Cost 1,429 1,702
Unrealized Gains 96 158
Unrealized Losses (9)
Fair Value 1,516 1,860
Trust Preferred Securities [Member]    
Adjusted Cost 3,147 3,147
Unrealized Gains 97 114
Unrealized Losses
Fair Value $ 3,244 $ 3,261