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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Cash flows from operating activities:    
Net income $ 8,560,000 $ 12,918,000
Adjustment to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 12,105,000 15,017,000
Unrealized foreign currency gain (2,030,000) (620,000)
Net (gain) loss on interest rate swaps (186,000) 342,000
Fair value adjustments to earnout liabilities (5,689,000) 460,000
Earnout payments (7,797,000)  
Loss on sale of property and equipment 87,000 199,000
Debt discount amortization 753,000 803,000
Share-based compensation expense 1,179,000 1,724,000
Bad debt expense 2,184,000 324,000
Inventory reserve expense 829,000 964,000
Deferred income taxes (164,000) (1,111,000)
Changes in operating assets and liabilities, net of acquisitions:    
Accounts receivable 12,718,000 15,221,000
Costs and estimated earnings in excess of billings on uncompleted contracts (183,000) 3,449,000
Inventories (606,000) 7,526,000
Prepaid expense and other current assets 1,720,000 (2,907,000)
Deferred charges and other assets 1,414,000 1,068,000
Accounts payable and accrued expenses (9,072,000) (10,010,000)
Billings in excess of costs and estimated earnings on uncompleted contracts (14,526,000) 6,859,000
Income taxes payable (857,000) 2,608,000
Other liabilities (1,528,000) (1,955,000)
Net cash (used in) provided by operating activities (1,089,000) 52,879,000
Cash flows from investing activities:    
Acquisitions of property and equipment (806,000) (811,000)
Proceeds from sale of property and equipment 367,000 301,000
Net cash used in investing activities (439,000) (510,000)
Cash flows from financing activities:    
Decrease in short-term and long-term restricted cash 878,000 2,853,000
Net borrowings (repayments) on revolving credit lines 2,197,000 (13,142,000)
Repayments of debt (9,161,000) (31,631,000)
Deferred financing fees paid (171,000)  
Payoff of loans on life insurance policies   (987,000)
Earnout payments (7,396,000) (9,270,000)
Proceeds from sale-leaseback transactions   14,244,000
Payments on capital lease and sale-leaseback financing liability (542,000) (241,000)
Proceeds from employee stock purchase plan, exercise of stock options, and dividend reinvestment plan 1,372,000 763,000
Repurchases of common stock   (188,000)
Dividends paid to common shareholders (7,787,000) (6,738,000)
Net cash used in financing activities (20,610,000) (44,337,000)
Effect of exchange rate changes on cash and cash equivalents 881,000 (412,000)
Net (decrease) increase in cash and cash equivalents (21,257,000) 7,620,000
Cash and cash equivalents at beginning of period 45,824,000 34,194,000
Cash and cash equivalents at end of period 24,567,000 41,814,000
Cash paid during the period for    
Interest 4,176,000 5,375,000
Income taxes $ 3,328,000 2,344,000
Non-cash transactions    
Property, plant and equipment acquired under capital leases   4,385,000
Noncontrolling interest acquired through an issuance of a note payable (See Note 17)   5,300,000
Earnout settled through an exchange of accounts receivable   $ 3,272,000