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Note 4 - Subordinated Secured Promissory Note Receivable - Subordinated Notes Receivable (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Notes Receivable, Par $ 7,716
Notes Receivable, Fair Value Adjustment (1,834)
Notes Receivable, Fair Value 5,882
A&R Subordinated Notes Receivable [Member]    
Notes Receivable, Par 3,376
Notes Receivable, Fair Value Adjustment (1,012)
Notes Receivable, Fair Value 2,364
S&L Subordinated Notes Receivable [Member]    
Notes Receivable, Par 4,340
Notes Receivable, Fair Value Adjustment (822)
Notes Receivable, Fair Value $ 3,518