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SUPPLEMENTAL CASH FLOW INFORMATION
6 Months Ended
Jun. 30, 2020
SUPPLEMENTAL CASH FLOW INFORMATION [Abstract]  
SUPPLEMENTAL CASH FLOW INFORMATION 11. SUPPLEMENTAL CASH FLOW INFORMATION

Supplemental cash flow information for the six months ended June 30, 2020 and 2019 was as follows:

Six Months Ended

June 30,

($ in thousands)

2020

2019

Interest paid

$

118

$

82

Federal, state, and local income taxes paid, net

$

7

$

5,326

Change in contract receivables, net

$

3,492

$

(1,959)

Change in contract liabilities, net

$

(3,492)

$

1,959

Property, plant, and equipment purchases in accounts payable

$

462

$

741