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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) (Parentheticals) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Additional Paid-in Capital [Member] | Restricted Stock [Member] | Director [Member]    
Stock compensation $ 90 $ 70
Share-based compensation 90 70
Additional Paid-in Capital [Member]    
Stock compensation 216 [1] 162 [2]
Share-based compensation 216 [1] 162 [2]
Stock compensation 216 [1] 162 [2]
Share-based compensation $ 216 [1] $ 162 [2]
[1] Approximately $90,000 was accrued as Share-based compensation at March 31, 2019 for restricted stock earned by non-employee directors but for which shares were not issued until April 2019.
[2] Approximately $70,000 was accrued as Share-based compensation at March 31, 2018 for restricted stock earned by non-employee directors but for which shares were not issued until April 2018.