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Available-For-Sale Securities Adjusted cost (Detail) - USD ($)
Sep. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Dec. 31, 2013
Cash and Cash Equivalents and Marketable Securities [Line Items]        
Cost $ 66,349,000 $ 51,833,000    
Unrealized Gains 701,000 914,000    
Unrealized Losses (626,000) (184,000)    
Accrued Interest 69,000 81,000    
Estimated Fair Value 66,493,000 52,644,000    
Cash & Cash Equivalents 38,994,000 24,459,000 $ 27,631,000 $ 36,382,000
Investment Securities 27,499,000 28,185,000    
Cash        
Cash and Cash Equivalents and Marketable Securities [Line Items]        
Cost 37,893,000 23,894,000    
Unrealized Gains 0 0    
Unrealized Losses 0 0    
Accrued Interest 0 0    
Estimated Fair Value 37,893,000 23,894,000    
Cash & Cash Equivalents 37,893,000 23,894,000    
Investment Securities 0 0    
Fair Value, Inputs, Level 1        
Cash and Cash Equivalents and Marketable Securities [Line Items]        
Cost 19,297,000 19,265,000    
Unrealized Gains 605,000 807,000    
Unrealized Losses (601,000) (165,000)    
Accrued Interest 12,000 15,000    
Estimated Fair Value 19,313,000 19,922,000    
Cash & Cash Equivalents 1,101,000 565,000    
Investment Securities 18,212,000 19,357,000    
Fair Value, Inputs, Level 1 | Money Market Accounts        
Cash and Cash Equivalents and Marketable Securities [Line Items]        
Cost 1,101,000 565,000    
Unrealized Gains 0 0    
Unrealized Losses 0 0    
Accrued Interest 0 0    
Estimated Fair Value 1,101,000 565,000    
Cash & Cash Equivalents 1,101,000 565,000    
Investment Securities 0 0    
Fair Value, Inputs, Level 1 | Mutual Funds        
Cash and Cash Equivalents and Marketable Securities [Line Items]        
Cost 9,760,000 10,733,000    
Unrealized Gains 32,000 63,000    
Unrealized Losses (344,000) (129,000)    
Accrued Interest 0 0    
Estimated Fair Value 9,448,000 10,667,000    
Cash & Cash Equivalents 0 0    
Investment Securities 9,448,000 10,667,000    
Fair Value, Inputs, Level 1 | Corporate Equity Securities        
Cash and Cash Equivalents and Marketable Securities [Line Items]        
Cost 3,914,000 3,408,000    
Unrealized Gains 525,000 695,000    
Unrealized Losses (255,000) (31,000)    
Accrued Interest 0 0    
Estimated Fair Value 4,184,000 4,072,000    
Cash & Cash Equivalents 0 0    
Investment Securities 4,184,000 4,072,000    
Fair Value, Inputs, Level 1 | Government & Agency Securities        
Cash and Cash Equivalents and Marketable Securities [Line Items]        
Cost 4,522,000 4,559,000    
Unrealized Gains 48,000 49,000    
Unrealized Losses (2,000) (5,000)    
Accrued Interest 12,000 15,000    
Estimated Fair Value 4,580,000 4,618,000    
Cash & Cash Equivalents 0 0    
Investment Securities 4,580,000 4,618,000    
Fair Value, Inputs, Level 2        
Cash and Cash Equivalents and Marketable Securities [Line Items]        
Cost 9,159,000 8,674,000    
Unrealized Gains 96,000 107,000    
Unrealized Losses (25,000) (19,000)    
Accrued Interest 57,000 66,000    
Estimated Fair Value 9,287,000 8,828,000    
Cash & Cash Equivalents 0 0    
Investment Securities 9,287,000 8,828,000    
Fair Value, Inputs, Level 2 | Municipal Bonds        
Cash and Cash Equivalents and Marketable Securities [Line Items]        
Cost 3,038,000 3,652,000    
Unrealized Gains 57,000 78,000    
Unrealized Losses (4,000) (7,000)    
Accrued Interest 18,000 28,000    
Estimated Fair Value 3,109,000 3,751,000    
Cash & Cash Equivalents 0 0    
Investment Securities 3,109,000 3,751,000    
Fair Value, Inputs, Level 2 | Corporate Bonds        
Cash and Cash Equivalents and Marketable Securities [Line Items]        
Cost 6,121,000 5,022,000    
Unrealized Gains 39,000 29,000    
Unrealized Losses (21,000) (12,000)    
Accrued Interest 39,000 38,000    
Estimated Fair Value 6,178,000 5,077,000    
Cash & Cash Equivalents 0 0    
Investment Securities $ 6,178,000 $ 5,077,000