CONDENSED BALANCE SHEETS (USD $)	Mar. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 10,773,513	$ 9,454,150
Accounts receivable, net of allowance for doubtful accounts of $71,921 as of March 31, 2015 and $28,119 as of December 31, 2014	3,517,255us-gaap_AccountsReceivableNetCurrent	1,960,214us-gaap_AccountsReceivableNetCurrent
Investments	7,928,974	7,913,793
Inventory, net	2,229,071us-gaap_InventoryNet	2,125,838us-gaap_InventoryNet
Prepaid expenses and other current assets	205,004	276,540
Prepaid income taxes	11,447us-gaap_PrepaidTaxes	320,941us-gaap_PrepaidTaxes
Deferred income taxes	148,415us-gaap_DeferredTaxAssetsNetCurrent	116,339us-gaap_DeferredTaxAssetsNetCurrent
Total current assets	24,813,679us-gaap_AssetsCurrent	22,167,815us-gaap_AssetsCurrent
Property and equipment, net	793,339us-gaap_PropertyPlantAndEquipmentNet	794,835us-gaap_PropertyPlantAndEquipmentNet
Intangible assets, net	186,684us-gaap_FiniteLivedIntangibleAssetsNet	250,836us-gaap_FiniteLivedIntangibleAssetsNet
Deferred income taxes	197,206us-gaap_DeferredTaxAssetsNetNoncurrent	76,557us-gaap_DeferredTaxAssetsNetNoncurrent
Other assets	20,720us-gaap_OtherAssetsNoncurrent	19,676us-gaap_OtherAssetsNoncurrent
Total assets	26,011,628us-gaap_Assets	23,309,719us-gaap_Assets
Current liabilities:
Accounts payable	781,585us-gaap_AccountsPayableCurrent	629,167us-gaap_AccountsPayableCurrent
Accrued payroll and benefits	676,529	1,244,898
Other accrued taxes	16,822	65,790
Warranty reserve	59,180	27,925
Deferred revenue	691,351us-gaap_DeferredRevenueCurrent	308,341us-gaap_DeferredRevenueCurrent
Accrued income taxes	653,414us-gaap_AccruedIncomeTaxesCurrent
Total current liabilities	2,878,881us-gaap_LiabilitiesCurrent	2,276,121us-gaap_LiabilitiesCurrent
Deferred revenue	165,859us-gaap_DeferredRevenueNoncurrent	142,902us-gaap_DeferredRevenueNoncurrent
Total liabilities	3,044,740us-gaap_Liabilities	2,419,023us-gaap_Liabilities
Stockholders' equity:
Common stock; $0.0001 par value; 90,000,000 shares authorized; 10,973,463 shares issued and outstanding as of March 31, 2015 and 10,814,650 shares issued and outstanding as of December 31, 2014	1,098us-gaap_CommonStockValue	1,082us-gaap_CommonStockValue
Additional paid-in capital	16,365,123us-gaap_AdditionalPaidInCapital	15,785,838us-gaap_AdditionalPaidInCapital
Retained earnings	6,612,744	5,125,249
Accumulated other comprehensive loss	(12,077)	(21,473)
Total stockholders' equity	22,966,888us-gaap_StockholdersEquity	20,890,696us-gaap_StockholdersEquity
Total liabilities and stockholders' equity	$ 26,011,628	$ 23,309,719

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19

-Subparagraph a

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(a))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682