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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2017
Accounting Policies [Abstract]  
Schedule of Inventory
At December 31, 2017 and 2016, inventory consisted of the following (in thousands):

 
2017
 
2016
Raw materials -current
$
22,813

 
$
15,877

Raw materials - long term
2,829

 
2,488

Finished Goods
1,022

 
2,558

Work in process
2,389

 
2,998

Total
$
29,053

 
$
23,921
Summary of Property and Equipment
The majority of our property and equipment, including rental equipment, is a direct cost to generating revenue and the following table depicts the depreciation associated with each product line at December 31, 2017 , 2016 and 2015 (in thousands):
 
2017
 
2016
 
2015
Rentals
$
20,861

 
$
21,325

 
$
22,308

Sales
265

 
291

 
281

Service & Maintenance
21

 
25

 
16

Total
$
21,147

 
$
21,641

 
$
22,605

Property and equipment consists of the following at December 31, 2017 and 2016 (in thousands):

 
Useful Lives (Years)
 
2017
 
2016
Land
—
 
$
1,290

 
$
169

Building
39
 
6,116

 
6,856

Leasehold improvements
39
 
808

 
794

Office equipment and furniture
5
 
1,490

 
1,454

Software
5
 
573

 
573

Machinery and equipment
7
 
3,133

 
3,111

Vehicles
3
 
5,516

 
6,063

Total

 
18,926

 
19,020

Less accumulated depreciation
 
 
(11,274
)
 
(11,267
)
Total
 
 
$
7,652

 
$
7,753
Schedule of Identified Finite-Lived Intangible Assets, Finite Lived
The following table represents the identified intangible assets by major asset class (in thousands):

 
 
 
 
December 31, 2017
 
December 31, 2016
 
 
 
 
 
Useful Life (years)
 
Gross Carrying Value
 
Accumulated Amortization
 
Net Book Value
 
Gross Carrying Value
 
Accumulated Amortization
 
Net Book Value
Developed Technology
 
20
 
$
2,505

 
$
1,633

 
$
872

 
$
2,505

 
$
1,508

 
$
997

Trade Name
 
Indefinite
 
654

 
—

 
654

 
654

 
—

 
654

Total
 
 
 
$
3,159

 
$
1,633

 
$
1,526

 
$
3,159

 
$
1,508

 
$
1,651
Schedule of Identified Indefinite-Lived Intangible Assets
The following table represents the identified intangible assets by major asset class (in thousands):

 
 
 
 
December 31, 2017
 
December 31, 2016
 
 
 
 
 
Useful Life (years)
 
Gross Carrying Value
 
Accumulated Amortization
 
Net Book Value
 
Gross Carrying Value
 
Accumulated Amortization
 
Net Book Value
Developed Technology
 
20
 
$
2,505

 
$
1,633

 
$
872

 
$
2,505

 
$
1,508

 
$
997

Trade Name
 
Indefinite
 
654

 
—

 
654

 
654

 
—

 
654

Total
 
 
 
$
3,159

 
$
1,633

 
$
1,526

 
$
3,159

 
$
1,508

 
$
1,651
Computation of Basic and Diluted Earnings Per Share
The following table sets forth the computation of basic and diluted earnings per share (in thousands, except per share amounts):
 
Year Ended December 31,
 
2017
 
2016
 
2015
Numerator:
 
 
 
 
 
Net income
$
19,851

 
$
6,469

 
$
10,147

Denominator for basic net income per common share:
 

 
 

 
 
Weighted average common shares outstanding
12,831

 
12,702

 
12,567

Denominator for diluted net income per share:
 

 
 

 
 
Weighted average common shares outstanding
12,831

 
12,702

 
12,567

Dilutive effect of stock options and restricted shares
279

 
233

 
226

Diluted weighted average shares
13,110

 
12,935

 
12,793

Earnings per common share:
 

 
 

 
 
Basic
$
1.55

 
$
0.51

 
$
0.81

Diluted
$
1.51

 
$
0.50

 
$
0.79