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Income Tax - Components of Deferred Tax Assets and Liabilities (Detail) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Deferred tax assets ("DTA")    
Allowance for doubtful accounts $ 420,000 $ 245,000
Unearned income 1,315,000 1,149,000
Investment in equity subsidiary 292,000 304,000
Alternative minimum tax 400,000 495,000
Share based compensation 379,000 89,000
Other temporary assets 679,000 687,000
Total gross deferred tax assets 3,485,000 2,969,000
Deferred tax liabilities ("DTL")    
Deferred compensation 1,270,000 1,144,000
Difference between the assigned values and the tax basis of assets and liabilities recognized in purchase 21,144,000 23,844,000
Total gross deferred tax liabilities 22,414,000 24,988,000
Deferred tax liability, net $ (18,929,000) $ (22,019,000)