Note A - Summary of Significant Accounting Policies (Tables)
|
12 Months Ended |
Sep. 30, 2016 |
|---|
| Useful Lives [Member] |
|
| Notes Tables |
|
| Property, Plant and Equipment [Table Text Block] |
| | Years | | Equipment | | 3 | - | 7 | | Leasehold improvements | | 7 | - | 10 or life of lease | | Vehicles | | | 3 | | |
| Investments Classified by Contractual Maturity Date [Table Text Block] |
| | | September 30, 2016 | | September 30, 2015 | | Less than one year | | $ | 5,527,075 | | | $ | 7,925,000 | | | 1-3 years | | | 10,703,000 | | | | 8,290,000 | | | Total | | $ | 16,230,075 | | | $ | 16,215,000 | | |
| Allowance for Credit Losses on Financing Receivables [Table Text Block] |
| Year Ended | | Balance at Beginning of Year | | Additions Charged to Costs and Expenses | | Less Write-offs | | Balance at End of Year | | September 30, 2016 | | $ | 79,473 | | | $ | 25,000 | | | $ | (11,000 | ) | | $ | 93,473 | | | September 30, 2015 | | | 97,950 | | | | - | | | | (18,477 | ) | | | 79,473 | | | September 30, 2014 | | | 97,950 | | | | - | | | | - | | | | 97,950 | | |
| Schedule of Inventory, Current [Table Text Block] |
| | | September 30,
2016 | | September 30,
2015 | | | | | | | | Raw materials | | $ | 5,702,762 | | | $ | 4,811,993 | | | Work-in-process | | | 471,305 | | | | 310,149 | | | Finished goods | | | 2,199,088 | | | | 2,060,712 | | | Inventories | | $ | 8,373,155 | | | $ | 7,182,854 | | |
| Property, Plant and Equipment [Table Text Block] |
| | | September 30,
2016 | | September 30,
2015 | | | | | | | | Manufacturing Equipment | | $ | 4,585,422 | | | $ | 4,102,868 | | | Office Equipment | | | 3,513,002 | | | | 2,655,088 | | | Leasehold Improvements | | | 2,422,669 | | | | 2,414,133 | | | Vehicles | | | 193,702 | | | | 193,702 | | | Property, plant and equipment, gross | | | 10,714,795 | | | | 9,365,791 | | | Less accumulated depreciation | | | 4,933,981 | | | | 3,676,118 | | | Property, plant and equipment, net | | $ | 5,780,814 | | | $ | 5,689,673 | | |
| Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
| Year ended September 30, | | 2016 | | 2015 | | 2014 | | Net income | | $ | 8,013,062 | | | $ | 4,682,008 | | | $ | 5,432,851 | | | Weighted average common shares | | | 13,372,579 | | | | 13,216,010 | | | | 12,916,273 | | | Dilutive potential common shares | | | 290,770 | | | | 371,522 | | | | 685,321 | | | Weighted average dilutive common shares outstanding | | | 13,663,349 | | | | 13,587,532 | | | | 13,601,594 | | | Earnings per share: | | | | | | | | | | | | | | Basic | | $ | 0.60 | | | $ | 0.35 | | | $ | 0.42 | | | Diluted | | $ | 0.59 | | | $ | 0.34 | | | $ | 0.40 | | |