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Shareholders' Equity and Accumulated Other Comprehensive Income (Details Narrative) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Equity [Abstract]        
Gain on sale of marketable equity securities eliminated   $ 0   $ 221
Income tax benefit eliminated   89   89
Adjusted unrealized gain on marketable equity securities   333   461
Amount of net loss reduced from $517,000 March 31, 2017 $530,000 June 30, 2017   $ 273   $ 379
Shares repurchased 92,586 30,300 145,200 39,700
Aggregate repurchase price $ 39 $ 22 $ 65  
Total shares repurchased     813,000  
Aggregate total purchase price     $ 413