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Available-For-Sale Securities Adjusted cost (Detail) - USD ($)
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Dec. 31, 2013
Cash and Cash Equivalents and Marketable Securities [Line Items]        
Cost $ 64,376,000 $ 51,833,000    
Unrealized Gains 864,000 914,000    
Unrealized Losses (282,000) (184,000)    
Accrued Interest 81,000 81,000    
Estimated Fair Value 65,039,000 52,644,000    
Cash & Cash Equivalents 37,145,000 24,459,000 $ 32,019,000 $ 36,382,000
Investment Securities 27,894,000 28,185,000    
Cash        
Cash and Cash Equivalents and Marketable Securities [Line Items]        
Cost 36,055,000 23,894,000    
Unrealized Gains 0 0    
Unrealized Losses 0 0    
Accrued Interest 0 0    
Estimated Fair Value 36,055,000 23,894,000    
Cash & Cash Equivalents 36,055,000 23,894,000    
Investment Securities 0 0    
Fair Value, Inputs, Level 1        
Cash and Cash Equivalents and Marketable Securities [Line Items]        
Cost 19,571,000 19,265,000    
Unrealized Gains 782,000 807,000    
Unrealized Losses (252,000) (165,000)    
Accrued Interest 14,000 15,000    
Estimated Fair Value 20,115,000 19,922,000    
Cash & Cash Equivalents 1,090,000 565,000    
Investment Securities 19,025,000 19,357,000    
Fair Value, Inputs, Level 1 | Money Market Accounts        
Cash and Cash Equivalents and Marketable Securities [Line Items]        
Cost 1,090,000 565,000    
Unrealized Gains 0 0    
Unrealized Losses 0 0    
Accrued Interest 0 0    
Estimated Fair Value 1,090,000 565,000    
Cash & Cash Equivalents 1,090,000 565,000    
Investment Securities 0 0    
Fair Value, Inputs, Level 1 | Mutual Funds        
Cash and Cash Equivalents and Marketable Securities [Line Items]        
Cost 9,748,000 10,733,000    
Unrealized Gains 81,000 63,000    
Unrealized Losses (156,000) (129,000)    
Accrued Interest 0 0    
Estimated Fair Value 9,673,000 10,667,000    
Cash & Cash Equivalents 0 0    
Investment Securities 9,673,000 10,667,000    
Fair Value, Inputs, Level 1 | Corporate Equity Securities        
Cash and Cash Equivalents and Marketable Securities [Line Items]        
Cost 3,855,000 3,408,000    
Unrealized Gains 661,000 695,000    
Unrealized Losses (85,000) (31,000)    
Accrued Interest 0 0    
Estimated Fair Value 4,431,000 4,072,000    
Cash & Cash Equivalents 0 0    
Investment Securities 4,431,000 4,072,000    
Fair Value, Inputs, Level 1 | Government & Agency Securities        
Cash and Cash Equivalents and Marketable Securities [Line Items]        
Cost 4,878,000 4,559,000    
Unrealized Gains 40,000 49,000    
Unrealized Losses (11,000) (5,000)    
Accrued Interest 14,000 15,000    
Estimated Fair Value 4,921,000 4,618,000    
Cash & Cash Equivalents 0 0    
Investment Securities 4,921,000 4,618,000    
Fair Value, Inputs, Level 2        
Cash and Cash Equivalents and Marketable Securities [Line Items]        
Cost 8,750,000 8,674,000    
Unrealized Gains 82,000 107,000    
Unrealized Losses (30,000) (19,000)    
Accrued Interest 67,000 66,000    
Estimated Fair Value 8,869,000 8,828,000    
Cash & Cash Equivalents 0 0    
Investment Securities 8,869,000 8,828,000    
Fair Value, Inputs, Level 2 | Municipal Bonds        
Cash and Cash Equivalents and Marketable Securities [Line Items]        
Cost 3,242,000 3,652,000    
Unrealized Gains 57,000 78,000    
Unrealized Losses (6,000) (7,000)    
Accrued Interest 23,000 28,000    
Estimated Fair Value 3,316,000 3,751,000    
Cash & Cash Equivalents 0 0    
Investment Securities 3,316,000 3,751,000    
Fair Value, Inputs, Level 2 | Corporate Bonds        
Cash and Cash Equivalents and Marketable Securities [Line Items]        
Cost 5,508,000 5,022,000    
Unrealized Gains 25,000 29,000    
Unrealized Losses (24,000) (12,000)    
Accrued Interest 44,000 38,000    
Estimated Fair Value 5,553,000 5,077,000    
Cash & Cash Equivalents 0 0    
Investment Securities $ 5,553,000 $ 5,077,000