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Note 5 - Marketable Securities, Available-for-sale (Tables)

12 Months Ended

Dec. 31, 2016

Schedule of Available-for-sale Securities Reconciliation [Table Text Block]

	December 31, 2016							December 31, 2015
	Amortized Cost		Gross Unrealized Losses			Estimated Fair Value		Amortized Cost		Gross Unrealized Gains		Estimated Fair Value
	(Dollars in thousands)
Type of security:
Municipal bond and metropolitan district securities	$	18,563	$	(465	)	$	18,098	$	19,439	$	5	$	19,444

Available-for-sale Securities [Table Text Block]

	December 31, 2016
	(Dollars in thousands)
Contractual maturity:
Maturing in one year or less	$	―
Maturing after three years		18,098
Total marketable securities, available-for-sale	$	18,098

- Definition

Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

+ References + Details