Note 7 - Investments in Marketable Securities (Details Textual) - USD ($) |
9 Months Ended | 12 Months Ended | |
---|---|---|---|
Sep. 30, 2015 |
Sep. 30, 2014 |
Dec. 31, 2014 |
|
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities | $ 0 | $ 0 | |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 81,966,000 | 103,814,000 | |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 1,234,000 | $ 824,000 | |
Proceeds from Sale and Maturity of Marketable Securities | 39,601,000 | $ 27,641,000 | |
Realized Investment Gains (Losses) | $ 449,000 | $ 172,000 |
X | ||||||||||
- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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X | ||||||||||
- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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X | ||||||||||
- Definition The amount by which the fair value of an investment in debt and equity securities categorized as Available-for-sale is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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X | ||||||||||
- Definition The cash inflow associated with the aggregate amount received by the entity through sale or maturity of marketable securities (held-to-maturity or available-for-sale) during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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X | ||||||||||
- Definition The net realized gains or losses on investments during the period, not including gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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