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Note 11 - Lease Commitments (Details Textual) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Dec. 31, 2015
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, Total $ 201,000        
Lessee, Operating Lease, Renewal Term 1 year        
Operating Leases, Rent Expense, Total $ 93,000 $ 98,000 $ 89,000    
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