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Note 12 - Lease Commitments (Details Textual) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Sep. 30, 2016
Operating Leases, Future Minimum Payments Due, Next Twelve Months $ 78,000      
Operating Leases, Future Minimum Payments, Due in Three Years 64,000      
Operating Leases, Future Minimum Payments, Due in Four Years 59,000      
Operating Leases, Future Minimum Payments Due $ 279,000      
Lessee, Operating Lease, Renewal Term 1 year      
Operating Leases, Rent Expense $ 98,000 $ 89,000 $ 30,000  
Operating Leases, Future Minimum Payments, Due in Two Years $ 78,000      
Heritage Hills [Member]        
Operating Leases, Future Minimum Payments Due, Next Twelve Months       $ 59,000
Branch Office Space Beginning April 2015 [Member]        
Operating Leases, Future Minimum Payments Due, Next Twelve Months     $ 19,000