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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Cash flows from operating activities:    
Net income $ 6,145 $ 4,260
Adjustments to reconcile net income to net cash provided by operating activities from continuing operations:    
Depreciation and amortization 1,076 1,609
Share-based compensation 957 524
Gain on sale of disposal of property, plant and equipment (49)  
Realized loss on investment securities, net 254 44
Deferred income taxes (242) (740)
Changes in assets and liabilities:    
Accounts receivable (102) (482)
Inventory (1,572) 92
Income taxes, prepaid 865 1,024
Prepaid expenses and other current assets 577 7
Other assets (4) 36
Accounts payable and accrued expenses (1,222) 1,268
Net cash provided by operating activities- continuing operations 6,683 7,642
Net cash flow provided by operating activities- discontinued   25
Net cash provided by operating activities 6,683 7,667
Cash Flow from Investing Activities:    
Sale of investment securities 760 2,021
Purchase of investment securities (1,365) (1,192)
Sale of property and equipment 59 456
Purchase of property and equipment (470) (83)
Net cash flow (used in) provided by investing activities (1,016) 1,202
Cash Flow from Financing Activities:    
Repayment of capital leases   (53)
Options exercised by executives and directors 568 26
Excess tax benefits from share-based compensation   96
Net shares repurchased for employee taxes (825) (703)
Cash dividends paid to stockholders (3,878) (2,968)
Net cash used in financing activities (4,135) (3,602)
Foreign currency impact 2 12
Increase in cash and cash equivalents 1,534 5,279
Cash and cash equivalents - beginning of the period 52,436 42,037
Cash and cash equivalents - end of period 53,970 47,316
Supplemental disclosure of cash flow information:    
Income taxes paid 1,928 1,659
Dividends declared included in accounts payable $ 3,991 $ 3,060