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Note 2 - Summary of Significant Accounting Policies - Disclosures of Cash Flow Information and Non-cash Transactions (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Cash paid during the period for:    
Interest $ 2,566 $ 2,210
Income taxes 127 105
Non-cash transactions:    
Assets acquired in settlement of loans 773 1,289
Reissuance of treasury stock as compensation $ 350 $ 53