XML 107 R81.htm IDEA: XBRL DOCUMENT v3.20.4
EQUITY PLANS EQUITY PLANS - Stock option (Details) - 2010 Option plan
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]  
Options outstanding, beginning balance (in shares) | shares 109,564
Stock options exercised (in shares) | shares (19,564)
Options outstanding, ending balance (in shares) | shares 90,000
Options exercisable (in shares) | shares 90,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]  
Outstanding - weighted average exercise price, beginning balance (in dollars per share) | $ / shares $ 4.31
Exercised - weighted average exercise price (in dollars per share) | $ / shares 4.31
Outstanding - weighted average exercise price, ending balance (in dollars per share) | $ / shares 4.31
Exercisable - weighted average exercise price (in dollars per share) | $ / shares $ 4.31
Outstanding - weighted average remaining contractual term 2 years 8 months 12 days
Exercisable - weighted average remaining contractual term 2 years 8 months 12 days
Outstanding - aggregate intrinsic value | $ $ 4.1
Exercisable - aggregate intrinsic value | $ $ 4.1