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Consolidated Balance Sheets (USD $)
Dec. 31, 2014
Dec. 31, 2013
Current assets:    
Cash and cash equivalents $ 39,866,037us-gaap_CashAndCashEquivalentsAtCarryingValue $ 40,869,457us-gaap_CashAndCashEquivalentsAtCarryingValue
Marketable securities 14,841,418us-gaap_MarketableSecuritiesCurrent 14,019,761us-gaap_MarketableSecuritiesCurrent
Accounts receivable, net of allowances 5,504,728us-gaap_AccountsReceivableNetCurrent 4,530,424us-gaap_AccountsReceivableNetCurrent
Inventories 5,600,319us-gaap_InventoryNet 5,722,882us-gaap_InventoryNet
Prepaid and other current assets 1,351,324us-gaap_PrepaidExpenseAndOtherAssetsCurrent 825,675us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Deferred tax assets 3,651,145us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent 2,711,516us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
Total current assets 70,814,971us-gaap_AssetsCurrent 68,679,715us-gaap_AssetsCurrent
Property and equipment, net 651,030us-gaap_PropertyPlantAndEquipmentNet 880,647us-gaap_PropertyPlantAndEquipmentNet
Intangible assets, net 21,568,541us-gaap_FiniteLivedIntangibleAssetsNet 15,498,819us-gaap_FiniteLivedIntangibleAssetsNet
Deferred tax assets 578,592us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent 1,208,891us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent
Other assets 1,791,980us-gaap_OtherAssetsNoncurrent 1,345,666us-gaap_OtherAssetsNoncurrent
Total assets 95,405,114us-gaap_Assets 87,613,738us-gaap_Assets
Current liabilities:    
Accounts payable 3,242,713us-gaap_AccountsPayableCurrent 2,035,853us-gaap_AccountsPayableCurrent
Other current liabilities 10,506,769us-gaap_AccruedLiabilitiesCurrent 5,509,917us-gaap_AccruedLiabilitiesCurrent
Total current liabilities 13,749,482us-gaap_LiabilitiesCurrent 7,545,770us-gaap_LiabilitiesCurrent
Revolving line of credit 0us-gaap_LongTermLineOfCredit 0us-gaap_LongTermLineOfCredit
Other long-term liabilities 902,841us-gaap_OtherLiabilitiesNoncurrent 776,125us-gaap_OtherLiabilitiesNoncurrent
Total liabilities 14,652,323us-gaap_Liabilities 8,321,895us-gaap_Liabilities
Commitments and contingencies      
Shareholders’ equity:    
Common stock – no par value; 100,000,000 shares authorized; 17,118,993 and 17,985,503 shares issued and outstanding as of December 31, 2014 and 2013, respectively 61,942,410us-gaap_CommonStockValueOutstanding 63,073,941us-gaap_CommonStockValueOutstanding
Retained earnings 18,818,263us-gaap_RetainedEarningsAccumulatedDeficit 16,394,540us-gaap_RetainedEarningsAccumulatedDeficit
Total shareholders’ equity 80,760,673us-gaap_StockholdersEquity 79,468,481us-gaap_StockholdersEquity
Noncontrolling interests (7,882)us-gaap_MinorityInterest (176,638)us-gaap_MinorityInterest
Total equity 80,752,791us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest 79,291,843us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Total liabilities and equity $ 95,405,114us-gaap_LiabilitiesAndStockholdersEquity $ 87,613,738us-gaap_LiabilitiesAndStockholdersEquity