Quarterly report pursuant to Section 13 or 15(d)

Note 9 - Share-based Compensation and Cash-based Incentive Compensation (Details Textual)

v3.19.2
Note 9 - Share-based Compensation and Cash-based Incentive Compensation (Details Textual)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2019
USD ($)
shares
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | shares 11,852,592  
Restricted Stock [Member]    
Share-based Compensation Arrangement By Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Grant Date Fair Value $ 0.3  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value 0.5  
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total 0.5  
Restricted Stock Units (RSUs) [Member]    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total $ 7.8  
Directors Compensation Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | shares 82,620  
Shares Issued, Shares, Share-based Payment Arrangement, Forfeited | shares 0  
Number of Cash-based Awards   2