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STATEMENTS OF CASH FLOWS (USD $)
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net (loss) income $ (13,335) $ 204,310
Adjustments to reconcile net (loss) income to net cash provided by operating activities:    
Depreciation 112,362 97,123
Amortization 719 719
Deferred income taxes 14,236 166,389
Stock-based compensation 7,358 8,381
Loss on disposal of fixed assets 0 37
Changes in:    
Receivables (88,616) (101,539)
Inventory 259,183 206,025
Prepaid expenses and other assets 1,028 (44,666)
Accounts payable 21,992 (68,510)
Accrued expenses (10,088) (22,969)
Net cash provided by operating activities 304,839 445,300
CASH FLOWS FROM INVESTING ACTIVITES :    
Purchase of property, plant and equipment (44,853) (8,949)
Maturities of short-term investments 1,494,000 500,000
Purchases of short-term investments (1,245,000) (1,245,000)
Purchases of long-term investments (496,000) 0
Net cash used for investing activities (291,853) (753,949)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Debt principal repayments (46,790) (44,633)
Proceeds from exercise of stock options 3,150 0
Net cash used for financing activities (43,640) (44,633)
NET DECREASE IN CASH AND CASH EQUIVALENTS (30,654) (353,282)
BEGINNING CASH AND CASH EQUIVALENTS 2,270,385 2,673,719
ENDING CASH AND CASH EQUIVALENTS 2,239,731 2,320,437
INCOME TAXES PAID 252 0
INTEREST EXPENSE PAID 15,175 17,327
NON-CASH ACTIVITIES:    
Change in capital expenditures included in accounts payable 191,862 8,357
Net change in fair value of interest rate swap $ 1,408 $ (5,810)