STOCK COMPENSATION - RESTRICTED STOCK AND PERFORMANCE SHARE GRANTS - Compensation Costs (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total Stock Compensation Costs	$ 1,389	$ 1,266
1998 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation costs, expensed	1,067	1,146
Capitalized	170	(10)
Total Stock Compensation Costs	1,237	1,136
NDSI Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation costs, expensed	$ 152	$ 130

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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