CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	6 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Cash Flows From Operating Activities:
Net income	$ 3,405,000	$ 2,666,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	851,000	785,000
Deferred income taxes	(178,000)	19,000
Stock-based compensation expense	383,000	395,000
Change in operating assets and liabilities:
Accounts receivable	803,000	(1,777,000)
Inventories	1,541,000	(1,252,000)
Other assets	(28,000)	38,000
Accounts payable	(136,000)	658,000
Accrued expenses	(1,083,000)	(514,000)
Income taxes payable	(329,000)	190,000
Net cash provided by operating activities	5,229,000	1,208,000
Cash Flows From Investing Activities:
Purchase of SeaBotix Inc.	(1,900,000)	(1,560,000)
Capital expenditures and other non-current assets	(476,000)	(595,000)
Net cash used by investing activities	(2,376,000)	(2,155,000)
Cash Flows From Financing Activities:
Dividends paid	(5,946,000)	(8,576,000)
Purchases of treasury stock	0	(966,000)
Exercise of stock options	277,000	79,000
Tax benefit (liability) from vested restricted stock and stock options exercised	28,000	(3,000)
Net cash used by financing activities	(5,641,000)	(9,466,000)
Net decrease in cash and cash equivalents	(2,788,000)	(10,413,000)
Cash and cash equivalents at beginning of period	24,613,000	31,683,000
Cash and cash equivalents at end of period	21,825,000	21,270,000
Supplemental Disclosure of Cash Flow Information:
Income taxes paid	$ 2,215,000	$ 779,000