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Investments in Tax-Exempt Bonds (Details) (USD $)
Mar. 31, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]    
Cost adjusted for pay-downs, held in trust $ 114,434,825 $ 88,257,386
Cost adjusted for pay-downs 79,236,600 48,827,485
Unrealized Gain, held in trust 15,957,203 11,277,142
Unrealized Gain 1,411,560 1,165,695
Unrealized Loss, held in trust (268) (446)
Unrealized Loss (4,180,745) (4,289,886)
Estimated Fair Value, held in trust 130,391,760 99,534,082
Estimated Fair Value 76,467,415 45,703,294
Arbors at Hickory Ridge [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Cost adjusted for pay-downs, held in trust 11,580,166 [1]  
Cost adjusted for pay-downs   11,581,485
Unrealized Gain, held in trust 1,226,315 [1]  
Unrealized Gain   610,785
Unrealized Loss, held in trust 0 [1]  
Unrealized Loss   0
Estimated Fair Value, held in trust 12,806,481 [1]  
Estimated Fair Value   12,192,270
Ashley Square [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Cost adjusted for pay-downs, held in trust 5,248,000 [2] 5,260,000 [2]
Unrealized Gain, held in trust 335,342 [2] 246,981 [2]
Unrealized Loss, held in trust 0 [2] 0 [2]
Estimated Fair Value, held in trust 5,583,342 [2] 5,506,981 [2]
Autumn Pines [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Cost adjusted for pay-downs, held in trust 12,227,249 [1] 12,217,004 [1]
Unrealized Gain, held in trust 1,390,673 [1] 953,024 [1]
Unrealized Loss, held in trust 0 [1] 0 [1]
Estimated Fair Value, held in trust 13,617,922 [1] 13,170,028 [1]
Bella Vista [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Cost adjusted for pay-downs, held in trust 6,600,000 [2] 6,600,000 [2]
Unrealized Gain, held in trust 141,570 [2] 93,324 [2]
Unrealized Loss, held in trust 0 [2] 0 [2]
Estimated Fair Value, held in trust 6,741,570 [2] 6,693,324 [2]
Bridle Ridge [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Cost adjusted for pay-downs, held in trust 7,740,000 [2] 7,765,000 [2]
Unrealized Gain, held in trust 273,377 [2] 108,632 [2]
Unrealized Loss, held in trust 0 [2] 0 [2]
Estimated Fair Value, held in trust 8,013,377 [2] 7,873,632 [2]
Brookstone [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Cost adjusted for pay-downs, held in trust 7,456,317 [2] 7,453,246 [2]
Unrealized Gain, held in trust 1,655,477 [2] 1,459,408 [2]
Unrealized Loss, held in trust 0 [2] 0 [2]
Estimated Fair Value, held in trust 9,111,794 [2] 8,912,654 [2]
Cross Creek [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Cost adjusted for pay-downs, held in trust 6,014,381 [2] 6,004,424 [2]
Unrealized Gain, held in trust 2,152,683 [2] 1,994,911 [2]
Unrealized Loss, held in trust 0 [2] 0 [2]
Estimated Fair Value, held in trust 8,167,064 [2] 7,999,335 [2]
Lost Creek [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Cost adjusted for pay-downs, held in trust 16,018,015 [2] 15,987,744 [2]
Unrealized Gain, held in trust 3,835,262 [2] 3,467,182 [2]
Unrealized Loss, held in trust 0 [2] 0 [2]
Estimated Fair Value, held in trust 19,853,277 [2] 19,454,926 [2]
Ohio Properties [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Estimated Fair Value 19,800,000  
Runnymede [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Cost adjusted for pay-downs, held in trust 10,605,000 [2] 10,605,000 [2]
Unrealized Gain, held in trust 851,157 [2] 491,330 [2]
Unrealized Loss, held in trust 0 [2] 0 [2]
Estimated Fair Value, held in trust 11,456,157 [2] 11,096,330 [2]
Southpark [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Cost adjusted for pay-downs, held in trust 11,924,697 [2] 11,904,968 [2]
Unrealized Gain, held in trust 2,767,047 [2] 2,462,350 [2]
Unrealized Loss, held in trust 0 [2] 0 [2]
Estimated Fair Value, held in trust 14,691,744 [2] 14,367,318 [2]
Woodlynn Village [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Cost adjusted for pay-downs, held in trust 4,460,000 [2] 4,460,000 [2]
Unrealized Gain, held in trust 0 [2] 0 [2]
Unrealized Loss, held in trust (268) [2] (446) [2]
Estimated Fair Value, held in trust 4,459,732 [2] 4,459,554 [2]
Avistar on the Boulevard [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Cost adjusted for pay-downs 16,976,000  
Unrealized Gain 190,396  
Unrealized Loss 0  
Estimated Fair Value 17,166,396  
Avistar at Chase Hill [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Cost adjusted for pay-downs 10,965,000  
Unrealized Gain 121,539  
Unrealized Loss 0  
Estimated Fair Value 11,086,539  
Avistar at the Crest [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Cost adjusted for pay-downs 10,459,000  
Unrealized Gain 0  
Unrealized Loss (100,011)  
Estimated Fair Value 10,358,989  
Iona Lakes [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Cost adjusted for pay-downs 15,535,000 15,535,000
Unrealized Gain 651,851 554,910
Unrealized Loss 0 0
Estimated Fair Value 16,186,851 16,089,910
Vantage at Judson [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Cost adjusted for pay-downs 6,049,000 6,049,000
Unrealized Gain 131,747 0
Unrealized Loss 0 (847)
Estimated Fair Value 6,180,747 6,048,153
Woodland Park [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Cost adjusted for pay-downs 15,662,000 15,662,000
Unrealized Gain 0 0
Unrealized Loss (4,080,734) (4,289,039)
Estimated Fair Value 11,581,266 11,372,961
Series A [Member] | Ohio Properties [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Cost adjusted for pay-downs, held in trust 14,561,000 [2]  
Unrealized Gain, held in trust 1,328,300 [2]  
Unrealized Loss, held in trust 0 [2]  
Estimated Fair Value, held in trust 15,889,300 [2]  
Series B [Member] | Ohio Properties [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Cost adjusted for pay-downs 3,590,600  
Unrealized Gain 316,027  
Unrealized Loss 0  
Estimated Fair Value $ 3,906,627  
[1] Bond held by Deutsche Bank in a secured financing transaction, Note
[2] Bonds owned by ATAX TEBS I, LLC, Note