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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Cash flows from operating activities:    
Net income (loss) $ (268,557) $ 26,512
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation and amortization expense 582,093 561,248
Deferred tax benefit 204,067 0
Share-based compensation 174,778 246,475
Excess tax expense (benefit) derived from exercise of stock options 427,993 (18,558)
Noncash interest expense 13,933 8,051
Noncash investment gains (46,577) (20,818)
Net changes in assets and liabilities affecting operating activities:    
Accounts receivable 1,254,320 329,862
Inventory 196,454 966,254
Other current assets and other assets (534,621) 130,321
Accounts payable and other current liabilities (1,483,998) (251,261)
Other long-term liabilities 78,602 55,735
Net cash provided by operating activities 598,487 2,033,821
Cash flows from investing activities:    
Additions to property and equipment (73,057) (108,658)
Purchases of marketable securities (1,166,218) (1,500,000)
Proceeds from sale of marketable securities 910,692 2,497,114
Additions to intangible assets (624,898) (2,062,321)
Net cash used in investing activities (953,481) (1,173,865)
Cash flows from financing activities:    
Exercise of stock options 0 12,000
Excess tax (expense) benefit derived from exercise of stock options (427,993) 18,558
Repurchase of common shares (979,293) (1,711,802)
Net cash used in financing activities (1,407,286) (1,681,244)
Net decrease in cash and cash equivalents (1,762,280) (821,288)
Cash and cash equivalents at beginning of period 38,203,059 39,866,037
Cash and cash equivalents at end of period $ 36,440,779 $ 39,044,749