Balance Sheets (USD $)
| Sep. 30, 2011 | Mar. 31, 2011 |
|---|
| ASSETS | | |
| Cash and cash equivalents | $ 1,324,236 | $ 952,209 |
| Marketable securities, short term | 11,122,455 | 7,970,358 |
| Accounts receivable, net of allowance for uncollectible accounts of $15,000 | 2,971,539 | 3,596,239 |
| Inventories | 3,382,028 | 3,343,857 |
| Deferred tax assets | 119,603 | 0 |
| Prepaid expenses and other assets | 1,354,995 | 1,185,306 |
| Total current assets | 20,274,856 | 17,047,969 |
| Fixed assets | | |
| Machinery and equipment | 6,471,536 | 6,178,207 |
| Leasehold improvements | 612,682 | 612,682 |
| Gross fixed assets | 7,084,218 | 6,790,889 |
| Less accumulated depreciation | 5,494,150 | 5,259,773 |
| Net fixed assets | 1,590,068 | 1,531,116 |
| Marketable securities, long term | 55,149,907 | 53,257,140 |
| Total assets | 77,014,831 | 71,836,225 |
| LIABILITIES AND SHAREHOLDERS' EQUITY | | |
| Accounts payable | 545,408 | 731,580 |
| Accrued payroll and other | 849,335 | 987,403 |
| Deferred taxes | 0 | 146,693 |
| Total current liabilities | 1,394,743 | 1,865,676 |
| Shareholders' equity | | |
| Common stock, $0.01 par value, 6,000,000 shares authorized; 4,776,198 issued and outstanding as of September 30 and March 31, 2011 | 47,762 | 47,762 |
| Additional paid-in capital | 20,974,926 | 20,894,766 |
| Accumulated other comprehensive income | 635,496 | 1,060,438 |
| Retained earnings | 53,961,904 | 47,967,583 |
| Total shareholders' equity | 75,620,088 | 69,970,549 |
| Total liabilities and shareholders' equity | $ 77,014,831 | $ 71,836,225 |