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Note 4 - Subordinated Secured Promissory Note Receivable (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Jul. 01, 2017
Mar. 31, 2018
Financing Receivable, Net, Total       $ 7,400,000
Notes Receivable, Interest Rate       6.00%
Interest Receivable $ 112,000 $ 112,000    
Disposal Group, Including Discontinued Operation, Consideration, Note Receivable, Adjustment       $ 2,600,000
Accretion (Amortization) of Discounts and Premiums, Investments 111,000 111,000  
Increase (Decrease) in Notes Receivables   223,000    
Notes Receivable, Fair Value Disclosure $ 5,100,000 $ 5,100,000