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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash flows from operating activities:      
Net income $ 27,721 $ 17,835 $ 20,058
Income from discontinued operations, net of tax     491
Income from continuing operations 27,721 17,835 19,567
Adjustments to reconcile net income to net cash provided by operating activities - continuing operations:      
Depreciation and amortization 4,209 5,405 7,115
Share-based compensation 4,267 3,428 3,081
Loss (gain) on sale of disposal of property, plant and equipment 94 (12) 81
Realized loss (gain) on investment securities, net 82 (118) (526)
Amortization of premium on investment securities 703 431 68
Deferred income taxes (623) (2,829) (106)
Impairment of fixed assets   6,083  
Changes in operating assets and liabilities:      
Accounts receivable 815 246 17
Inventory (1,017) (4,976) 2,400
Income taxes, prepaid (1,023) 300 3,550
Prepaid expenses and other current assets (686) (616) (56)
Other assets (1,958) 43 292
Accounts payable and accrued expenses 10,653 770 (2,363)
Net cash flow provided by operating activities- continuing operations 43,237 25,990 33,120
Net cash flow used in operating activities- discontinued operations   (640) (3,709)
Net cash flow provided by operating activities 43,237 25,350 29,411
Investing Activities:      
Sale of investment securities 6,954 26,741 11,880
Purchase of investment securities (6,956) (26,578) (9,250)
Sale of property and equipment 81 676  
Purchase of property and equipment (3,242) (2,876) (2,819)
Net cash flow used in investing activities (3,163) (2,037) (189)
Financing Activities:      
Decrease in note receivable     45
Repayment of capital leases   (219) (255)
Options exercised by executives and directors 568 299 44
Excess tax benefits from share-based compensation   230 247
Net shares repurchased for employee taxes (2,540) (1,342) (1,296)
Purchase of treasury stock     (10,516)
Cash dividends paid to stockholders (15,390) (11,889)  
Net cash used in financing activities (17,362) (12,921) (11,731)
Foreign currency impact (71) 7 87
Increase in cash and cash equivalents 22,641 10,399 17,578
Cash and cash equivalents - beginning of the period 52,436 42,037 24,459
Cash and cash equivalents - end of period 75,077 52,436 42,037
Supplemental disclosure of cash flow information:      
Income taxes paid 13,622 11,615 4,182
Dividends declared included in accounts payable $ 6,105 $ 4,039 $ 3,013