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Available-For-Sale Securities Adjusted cost (Detail) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Cash and Cash Equivalents and Marketable Securities [Line Items]        
Cost $ 67,237,000 $ 51,833,000    
Unrealized Gains 372,000 914,000    
Unrealized Losses (583,000) (184,000)    
Accrued Interest 83,000 81,000    
Estimated Fair Value 67,109,000 52,644,000    
Cash & Cash Equivalents 42,037,000 24,459,000 $ 36,382,000 $ 39,937,000
Investment Securities 25,072,000 28,185,000    
Cash        
Cash and Cash Equivalents and Marketable Securities [Line Items]        
Cost 38,276,000 23,894,000    
Unrealized Gains 0 0    
Unrealized Losses 0 0    
Accrued Interest 0 0    
Estimated Fair Value 38,276,000 23,894,000    
Cash & Cash Equivalents 38,276,000 23,894,000    
Investment Securities 0 0    
Fair Value, Inputs, Level 1        
Cash and Cash Equivalents and Marketable Securities [Line Items]        
Cost 20,172,000 19,265,000    
Unrealized Gains 308,000 807,000    
Unrealized Losses (539,000) (165,000)    
Accrued Interest 17,000 15,000    
Estimated Fair Value 19,958,000 19,922,000    
Cash & Cash Equivalents 3,761,000 565,000    
Investment Securities 16,197,000 19,357,000    
Fair Value, Inputs, Level 1 | Money Market Accounts        
Cash and Cash Equivalents and Marketable Securities [Line Items]        
Cost 3,761,000 565,000    
Unrealized Gains 0 0    
Unrealized Losses 0 0    
Accrued Interest 0 0    
Estimated Fair Value 3,761,000 565,000    
Cash & Cash Equivalents 3,761,000 565,000    
Investment Securities 0 0    
Fair Value, Inputs, Level 1 | Mutual Funds        
Cash and Cash Equivalents and Marketable Securities [Line Items]        
Cost 9,654,000 10,733,000    
Unrealized Gains 37,000 63,000    
Unrealized Losses (444,000) (129,000)    
Accrued Interest 0 0    
Estimated Fair Value 9,247,000 10,667,000    
Cash & Cash Equivalents 0 0    
Investment Securities 9,247,000 10,667,000    
Fair Value, Inputs, Level 1 | Corporate Equity Securities        
Cash and Cash Equivalents and Marketable Securities [Line Items]        
Cost 1,332,000 3,408,000    
Unrealized Gains 246,000 695,000    
Unrealized Losses (76,000) (31,000)    
Accrued Interest 0 0    
Estimated Fair Value 1,502,000 4,072,000    
Cash & Cash Equivalents 0 0    
Investment Securities 1,502,000 4,072,000    
Fair Value, Inputs, Level 1 | Government & Agency Securities        
Cash and Cash Equivalents and Marketable Securities [Line Items]        
Cost 5,425,000 4,559,000    
Unrealized Gains 25,000 49,000    
Unrealized Losses (19,000) (5,000)    
Accrued Interest 17,000 15,000    
Estimated Fair Value 5,448,000 4,618,000    
Cash & Cash Equivalents 0 0    
Investment Securities 5,448,000 4,618,000    
Fair Value, Inputs, Level 2        
Cash and Cash Equivalents and Marketable Securities [Line Items]        
Cost 8,789,000 8,674,000    
Unrealized Gains 64,000 107,000    
Unrealized Losses (44,000) (19,000)    
Accrued Interest 66,000 66,000    
Estimated Fair Value 8,875,000 8,828,000    
Cash & Cash Equivalents 0 0    
Investment Securities 8,875,000 8,828,000    
Fair Value, Inputs, Level 2 | Municipal Bonds        
Cash and Cash Equivalents and Marketable Securities [Line Items]        
Cost 2,735,000 3,652,000    
Unrealized Gains 42,000 78,000    
Unrealized Losses (3,000) (7,000)    
Accrued Interest 20,000 28,000    
Estimated Fair Value 2,794,000 3,751,000    
Cash & Cash Equivalents 0 0    
Investment Securities 2,794,000 3,751,000    
Fair Value, Inputs, Level 2 | Corporate Bonds        
Cash and Cash Equivalents and Marketable Securities [Line Items]        
Cost 6,054,000 5,022,000    
Unrealized Gains 22,000 29,000    
Unrealized Losses (41,000) (12,000)    
Accrued Interest 46,000 38,000    
Estimated Fair Value 6,081,000 5,077,000    
Cash & Cash Equivalents 0 0    
Investment Securities $ 6,081,000 $ 5,077,000