XML 72 R57.htm IDEA: XBRL DOCUMENT v3.10.0.1
Note 4 - Investments - Contractual Maturities of Available-for-sale Securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Due in one year or less, cost $ 147,908  
Due in one year or less, fair value 147,712  
Due between one and five years, cost 75,458  
Due between one and five years, fair value 75,236  
Due after five years, cost 12,400  
Due after five years, fair value 12,391  
Available-for-sale securities, cost 235,766 $ 241,977
Available-for-sale securities, fair value $ 235,339 $ 241,737