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Note 3 - Subordinated Secured Promissory Note Receivable (Details Textual)
Mar. 31, 2018
USD ($)
Mar. 02, 2018
USD ($)
Financing Receivable, Net, Total $ 7,400,000  
Notes Receivable, Interest Rate 6.00%  
Interest Receivable $ 37,000  
Notes Receivable, Discount Rate Applied to Expected Cash Flow Stream 18  
Disposal Group, Including Discontinued Operation, Consideration, Note Receivable, Adjustment $ 2,600,000 $ 2,600
Notes Receivable, Fair Value Disclosure $ 4,800,000