Note 11 - Fair Value of Financial Instruments and Fair Value Measurements - Quantitative Information About Recurring Level 3 Fair Value Measurement (Details) - US States and Political Subdivisions Debt Securities [Member] $ in Thousands	6 Months Ended
	Jun. 30, 2017 USD ($)
Fair Value	$ 576
Range Weighted Average		[1]

[1] The Company relies on a third-party pricing service to value its municipal securities. The details of the unobservable inputs and other adjustments used by the third-party pricing service were not readily available to the Company.